Article number: 23(3):a51
Copyright Paleontological Society, November 2020
Submission: 21 October 2019. Acceptance: 23 October 2020.
Jurassic plant macrofossils from along New Zealand’s far-south ‘Catlins Coast’ (between Fortrose and the mouth of the Catlins River) are described. New records and the consequences of other taxonomic changes means there are additions to the list of plant taxa in the New Zealand Jurassic.
Hausmannia, Archangelskya, Pseudoctenis, and Bellarinea are recorded for the first time in New Zealand. The taxonomic changes include synonymising Equisetum nicoli with E. laterale, transferring Pterostoma matauraensis to Pseudoctenis ? ensiformis, and Ptilophyllum acutifolium to Otozamites douglasii. The material commonly ascribed to Cladophlebis australis remains problematic, but is here regarded as C. patagonica, although other species may exist.
There is little clear indication of floristic assemblages restricted to particular facies. Very low diversity assemblages with Cladophlebis and/or Taeniopteris are almost ubiquitous, and probably represent a very generalised pioneering vegetation. Conifers may have been added as a component of a later stage of succession. A notably distinct assemblage, dominated by very narrow leaved Taeniopteris and Bellarinea, occurs in the axis of the Waikawa Syncline. It may be the youngest assemblage in the region and could be of zonal significance.
Due to its location on an independent terrane, the exact location of the Catlins area during the Jurassic is unclear, although it was somewhere along the edge of Gondwana and possibly not far from what is now Queensland. The low diversity and relatively small leaves of the assemblages is consistent with a relatively high-latitude setting. Current knowledge probably cannot confirm the palaeolatitude more precisely than somewhere below the Polar Circle, to significantly above it.
Mike Pole. Queensland Herbarium, Brisbane Botanic Gardens Mt Coot-tha, Toowong, Qld, Australia.
Keywords: Murihiku; Jurassic; Catlins; macrofossils
Final citation: Pole, Mike. 2020. Middle-Late Jurassic plant assemblages of the Catlins coast, New Zealand. Palaeontologia Electronica, 23(3):a51. https://doi.org/10.26879/1039
Copyright: November 2020 Paleontological Society.
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The ‘Catlins coast’ lies in the southeastern corner of the South Island of New Zealand and roughly describes the area between the Catlins River and Fortrose (Figure 1). It is relatively remote and still poorly known geologically. However, it includes Curio Bay, a well-known tourist destination with in situ Jurassic fossil forests.
The macropalaeobotany of the area has been described in several papers, including the comprehensive works of Arber (1917) and Edwards (1934), and the classic silicified fern work of Kidston and Gwynne-Vaughan (1907, 1908, 1909, 1910). A significant addition described a new wood genus, Donponoxylon, with similarities to the well-known Pentoxylon (Tidwell et al., 2013). The macroflora of New Zealand’s Jurassic was reviewed by Pole (2009; note also Johnston et al., 1987, and Raine, 1982, 1987, which were inadvertently omitted). Palynological studies covering the area include those of de Jersey and Raine (1990) and Thorn (2001).
The aim of this paper is to document new palaeobotanical material from the Catlins Coast. This is an opportunity to both reviewing the taxonomy of fossil plants from localities that have been long-known in the light of recent papers elsewhere, as well as introducing some new ones.
The Catlins Coast area was geologically mapped by Watters et al. (1968) on a scale of 1: 250 000. Details of the northern region were documented by Speden (1971) and of the south by Noda et al. (2002) and Pole (2004). Most of the southern region was included in the Ferndale Group by Turnbull and Allibone (2003), as well as exposures of the underlying Diamond Peak Group, for instance from The Sisters north to Chaslands.
The regional basement forms part of the Murihiku Terrane/Supergroup (Campbell and Coombs, 1966; Campbell et al., 2003), which was either a fore-arc (Briggs et al., 2004) or back-arc basin (Coombs et al., 1996) and deposited somewhere distal to a volcanically active margin, represented in New Zealand by the Median Batholith (Mortimer et al., 1999) along the margin of Gondwana (Ballance and Campbell, 1993; Grant-Mackie et al., 2000). The Murihiku Terrane is now separated from the Median Batholith by the Permian Brook Street Terrane, and its original location along the Gondwana foreland is unknown. Adams (2010) and Adams et al. (2007) have suggested that in general, before they amalgamated, there was an anti-clockwise movement of terranes in the New Zealand sector of the Pacific. Thus, the Murihiku Terrane is likely to have come from somewhere further north with respect to Australia.
Dating on the south limb of the Southland Syncline is hampered by the paucity of marine beds, tectonic breaks in the succession, and broad-ranging macrofloral taxa. Regional mapping began with Wood (1956) who divided the Catlins Jurassic into the Diamond Peak Group, the Ferndale Group, and the Mataura Group. Speden (1958) dated the Owaka Creek plant beds as lower to middle Callovian “or somewhat younger” (essentially latest Temaikan, Middle Jurassic) based on underlying marine fossils. The regional map of Watters et al. (1968) indicated the strata at Curio Bay as Temaikan (Middle Jurassic). This age was refined to Bathonian-Callovian (late Temaikan, c. 167-157 Ma) using palynological data (J.L. McKellar, J.I. Raine, and N. de Jersey, pers. comm., 1997 in Pole, 2001). Campbell et al. (2003) gave redefinitions for all three groups, which included an Early Jurassic, marine origin for the Diamond Peak Group, an early Middle Jurassic, marine-marginal marine origin for the Ferndale Group (which included Curio Bay), and a late Middle Jurassic, broader marine-terrestrial origin of the Mataura Group. The distribution of these groups was subsequently indicated by regional mapping (Turnbull and Alibone, 2003).
Pole (2004) attempted to trace the strata of the Fortrose-Chaslands coast into the better-dated marine material to the north but found apparent major breaks in stratigraphic continuity. He divided the coast into two tectonic ‘blocks’, the Slope Point Block and the Brothers Block, which were tectonically separate from the south limb of the Southland Syncline. Pole (2004) interpreted the sedimentary rocks of the Fortrose-Otara coast to be stratigraphically continuous with those at Curio Bay, but to lie some 500 m lower in the succession.
Pole (2004) wrote “The Brothers Block is unlikely to be younger than the youngest strata of the Papatowai Subdivision (which would make it the youngest Jurassic in Southland) although not impossible.” Based on Carter’s (1979) interpretation of the Southland Jurassic as generally regressive, the presence of marine strata in the Brothers Block suggested that it was “more likely that the Brothers Block correlates with the older Papatowai Subdivision units” and was broadly Lower Jurassic. However, whole-rock dating of Hoiho Conglomerate clasts in the Brothers Block (Noda et al., 2004) found one to be 156 ± 8 Ma (Oxfordian, Heterian, earliest Late Jurassic). On this basis, the Brothers Block is indeed the youngest Jurassic in Southland, and this dating supports the existence of a tectonic break between it and the Slope Point Block (Pole, 2004), which includes Curio Bay. The strata along the Fortrose-Otara coast dip at a low angle (about 2-3°) to the northeast and strike approximately northwest-southeast, parallel to their exposure in coastal cliffs. They are distinct from those sedimentary rocks at Curio Bay, as they include extensive overbank fines, penetrating plants roots, coal, and well-sorted fluvial sands. They may correlate with the marine Pounawea Formation further to the north on the South Limb of the Syncline. Further assessment of their age is pending.
METHODS AND LOCALITIES
This report is based on field work in the Catlins Coast region that has continued from the late 1970s until the present. It focuses on 10 broad localities (examples illustrated in Figure 2 and current understanding their stratigraphic relationships in Figure 3) in which plant macrofossils are present. Individual samples (i.e., separate beds or widely separated occurrences of beach boulders) are numbered with the general locality prefix. A GPS was used to locate the samples (accuracy c. 15 m), and coordinates are given in New Zealand Transverse Mercator (NZTM). Specimens are numbered with the prefix ‘LX’ and deposited in the Geology Department, Auckland University. Unsuccessful attempts to isolate cuticle were made using hydrogen peroxide, chromium trioxide, and Schultze solution on the most likely specimens. However, the material is too metamorphosed and/or weathered for cuticle to survive, and therefore the study involved reflected light investigation of what are essentially impressions. The absence of cuticle and attached reproductive structures is a common problem for Mesozoic material, hampering confident placement into taxonomic levels, such as the family. The approach taken here is to place the taxa into their most-likely position in the Linnaean hierarchy, and then discussed, where appropriate, under the remarks. This is a pragmatic way of structuring the paper. It is not an assertion that any placement has been ‘proved’ and certainly not a claim that a particular form-genus can be assigned to a certain family.
Plant fossils are common along approximately 2.5 km of coast adjacent to the community of Otara (from NZTM: 1280644, 4828974 to 1280736, 4826569). The facies are relatively muddy and include very carbonaceous muds to thin coal beds and fossil soils (plant root horizons and at least eight in situ tree stump horizons) along with other fossil plant material. They are interpreted as mainly flood-basin fill, with mires, crevasse splay and avulsion deposits. A prominent light-coloured crystal tuff, composed of angular plagioclase crystals and containing large carbonised tree logs, provides a convenient marker-horizon at the northwest end. The facies are much more homogenous mud in the southeast. Samples from this region are prefixed with ‘Otara-’. The relevant samples are:
- Otara-8 cliff exposure, greenish silt with roots, c. 30 cm below base of prominent channel sandstone and c. 30 cm above 20 cm thick unit of very carbonaceous mud-coal (NZTM: 1280544, 4828454)
- Otara-20, beach outcrop at high tide level (NZTM: 1280602, 4827577).
- Otara-21, fallen boulders at base of cliff (NZTM: 1280583, 4827644).
- Otara-31, base of cliff, grey mud underlying rusty stained mud (NZTM: 1280680, 4827000).
- Otara-32, base of cliff, grey mud underlying rusty stained mud, equivalent to Otara-31 (NZTM: 1280720, 4826960).
- Otara-33, base of cliff, c. 1.5 m above high water and under a small waterfall (NZTM: 1280530, 4827668).
- Otara-34, beach exposure between cliffs and reef (NZTM: 1280736, 4826569).
- Otara-35 base of cliff, c. 1.5 m above high water, immediately to left of small gully and waterfall (NZTM: 1280569, 4827680).
- Otara-36, c. 2 m of grey mud, minor faulting and folding, about 8 m stratigraphically above the crystal tuff.
A fine-grained, plant rich bed was collected from the edge of the cove about one kilometre east of Black Point in the 1980s and 1990s (NZTM 1292380, 4823930). It includes the material described as Palissya by Parris et al. (1995). The horizon has not been located since and appears to have been covered by slumping.
- Slope-01, fossil foliage and silicified wood is present in the boulders in the tidal zone along the western margin of the Haldane Bay (NZTM: 1296090, 4824550).
- Slope-02, very fine-grained beds (claystone) on the far eastern extent of the coastal cliffs extending east from Slope Point, almost to Haldane Bay, containing abundant Cladophlebis (NZTM: 1295955, 4824004).
- Slope-03, loose blocks of sandstone at base of cliff (NZTM: 1294561, 4823533).
- Slope-04, boulders in rubble on platform at south end of bay (NZTM: 1295709, 4823749).
Blue Cod Bay
Plant fossils are common in the boulders of Blue Cod Bay (NZTM: 1299957, 4824414).
Curio Bay is a well-known locality (Arber, 1917; Edwards, 1934) containing in situ fossil forest horizons (NZTM: 1301560, 4824990). Older collections refer to it as ‘Waikawa’ (the name of a nearby village). The main forest horizon was composed of a relatively low canopy of conifers (Pole, 1999) with an understory of ‘tree ferns’ and non-coniferous gymnosperms. Multiple forest horizons appear to have been overwhelmed by a series of relatively unconfined fluvial flows (Pole, 2001). The dominant architecture is sheet-like. Broad channels are present, with a fill of poorly sorted very coarse-grained sandstone and grit, in some places as large (meter-scale) trough cross beds. A typical braided stream origin is not clear, based on the absence of planar tabular cross beds. A meandering stream origin is even less likely given the absence of lateral accretion and suspension sediment. However, there are relatively fine beds, some of lamina thickness, and they are associated with in situ fossil trees. These suggest an overbank/floodplain environment, but there is no evidence of clear channel/overbank distinction.
Haldane-Curio Bay Road
In 1982 a small road side exposure was collected on the Haldane-Curio Bay Road, about 400 m from the intersection with the Waikawa-Curio Bay Road (NZTM: 1301380, 4826200). It is very overgrown now. The material is highly weathered to a pale mud. Because of very limited exposure, little can be said of its sedimentology. The plant fossil assemblage is distinct in that it contains Pseudoctenis? ensiformis (previously Pterophyllum matauraensis Hector, 1886), the first New Zealand record of this taxon outside of its type locality of Mataura.
The Boat Harbour
A Cladophlebis-dominated unit is present in the ‘Boat Harbour’ on the northwest side of Brothers Peninsula (NZTM: 1308699, 4826392). Noda et al. (2002, fig. 10A) illustrated Cladophlebis indica from here.
Little Beach/Waikawa Syncline
This broad locality covers a plant-fossil rich zone (c. 10 m thick) in the core of the Waikawa Syncline. Beach boulders with prominent narrow- Taeniopteris and Bellarinea are present from the southernmost end of Little Beach and also in the unnamed bays south of the headland through which the axis of the Waikawa Syncline lies. Both regions are taken to expose the same unit, although continuous foot access around the intervening headlands is not possible.
- Little-01, boulders scattered along the southern end of Little Beach (NZTM: 1311943, 4827334).
- Little-02, prominent in situ silt unit under overhang on south side of cliff (NZTM: 1311522, 4827197).
- Little-03, beach boulders in the bay extending 100 m southwest from Little-02 (NZTM: 1311470, 4827167)
- Little-04, beach boulders in the bay immediately south of Little Beach (NZTM: 1311531, 4827304).
Noda et al. (2002) mapped this as part of their ‘Lithofacies association D - meandering river and floodplain’. They wrote (p. 308) “The dominance of planar cross-stratified and horizontally stratified sandstones is interpreted to indicate deposition under a lower energy flow regime.... A meandering river and flood plain are considered to be the possible sedimentary environment.”
The present study finds no evidence for meandering stream origin - there is no sign of lateral accretion deposits characteristic of meandering channels or trough bedding. By themselves, planar cross-stratified beds are more indicative of braided deposition (Miall, 1977, 1978), and horizontally stratified sandstone is an indication of upper, rather than lower energy flow.
The sequence is sand-dominated (mud is essentially absent), with sharply defined boundaries between beds of different sand grades. Beds may be very thin (essentially lamina), with an internal architecture varying from planar cross-bedded, convoluted, to massive. Buried tree stumps in growth position within a carbonaceous sandy soil, may project through several distinct beds and indicate rapidly changing energy conditions. Minor bioturbation, lags of rip-up fine sandstone clasts. The geology is broadly comparable with the finer-grained parts of Curio Bay (Pole, 2001).
A small outcrop with plant fossils occurring on farmland near the Owaka River (NZTM 1344900, 4851250) has been known since at least 1865 (collected by Hector as noted by Arber, 1917) and further described by McKay (1877) and Arber (1917). Mackie (1935) placed the beds in the upper part of his J14 unit, of ‘Lower Oolite’ age. Speden (1958) documented the local stratigraphy and found that the plant beds overlay marine beds of lower to middle Callovian age. He concluded they were of equivalent age (he surmised they represented a local shallowing in estuarine-terrestrial conditions), or “somewhat younger”. He later (Speden, 1971) documented the more regional geology of the area and placed the plant beds at the top of his Pounawea Formation. Outcrop is now restricted and the material much weathered. The thin beds of sandstone and mudstone are probably flood-basin deposits.
Plant fossils are numerous in the boulders and shore platform near the feature known as The Chasm (NZTM: 1339054, 4837558). The locality was documented by Speden (1971, p. 72), who placed it in the Purakauiti Formation, about 530-595 m from the base. According to Speden (1971) the Purakauiti Formation is about 1190 m thick, lithologically heterogeneous, and includes many marine units as well as its characteristic carbonaceous beds. Marine invertebrates date the entire Purakauiti Formation as Temaikan, with Speden (1971) regarding it more specifically as “Lower Temaikan”. He recorded marine invertebrates about 150 m stratigraphically above the Chasm Island plant beds. From the plant beds Speden listed; Cladophlebis australis, C. antarctica, C. cf. reversa, Taeniopteris, Dictyophyllum, Sphenopteris (Ruffordia) goepperti, Elatocladus conferta, ? Brachyphyllum, ? Nageiopsis, a ?conifer cone and some less identifiable fragments.
The section consists of sheet-like, sand-dominated units. Although access to the good exposure of the cliffs is very limited, and many of the beds are internally massive, examples of good bedding structures can be found as boulders on the shore. The mixture of trough cross-bedding, lag horizons of well-rounded cobbles, penetrating roots, and alternating thin beds, is consistent with a generally low-lying fluvial environment. Although clear marine strata lie above, there is no conclusive evidence of marine influence, such as tidal processes, at Chasm Island.
Class POLYPODIOPSIDA sensu Ruggiero et al., 2015
Family OSMUNDACEAE Berchtold and Presl, 1820
Genus CLADOPHLEBIS Brongniart, 1849, emend. Seward, 1894
Remarks. Cladophlebis is probably the most ubiquitous plant fossil in the New Zealand Jurassic but despite this, nomenclature remains unclear. The first publication of plant fossils from New Zealand (Unger, 1864) describes Polypodium hochstetteri, material which would now be regarded as Cladophlebis. By the time of Arber (1917) and Edwards (1934) at least five species of Cladophlebis apparently, were known in the New Zealand Jurassic; Cladophlebis australis, C. sp. cf. C. albertsi, C. antarctica, C. denticulate, and C. cf. reversa. Arber (1917, p. 31) regarded C. australis as the “most abundant of all species, without exception” in the New Zealand Jurassic. Then, based on one of Arber’s (1917, pl. 4 fig. 1) figures of Cladophlebis australis, Frenguelli (1947) erected a new species, Cladophlebis patagonica. In this taxon, the pinnules were distinctly elongate and well-separated from each other, and with lateral veins that mostly bifurcated a single time, except for one of the two basal veins that could sporadically dichotomise again. He reserved C. australis for specimens in which double-bifurcation was prominent (Retallack, 1983, noted that in this sense, C. australis would be generally restricted to the Triassic). McQueen (1956) accepted C. australis and remarked on the variability of the pinnule wing.
Herbst (1966) formalised the description of Cladophlebis patagonica but illustrated it with a line drawing of a frond entirely different from Frenguelli’s (1947) concept of the species. In Herbst’s (1966) illustration, the pinnules are (or are almost) touching each other. The veins all fork once, except for two possible indications of a second dichotomy. The veins are also dense and markedly reflexed. In his later review of Argentinian Cladophlebis, his figure (Herbst, 1971, fig. 3) of C. patagonica again showed neither the well-separated pinnules nor the basal twice-forking venation that was the basis for Frenguelli (1947) to separate a new species.
Johnston et al. (1987) argued that New Zealand Cladophlebis that had once-forking secondary venation had been commonly misidentified as C. australis, and instead, compared most records with C. indica (Sahni and Rao, 1933). Included in their concept of C. cf. C. indica was Arber’s (1917) pl. 4 fig. 1 specimen, which Frenguelli (1947) had figured as C. patagonica. The specimen of C. cf. C. indica illustrated by Johnston et al. (1987) from the Jurassic of Nelson is only the apex of a single pinnule, so does not show the full shape, pinnule separation, or basal venation that would be required to distinguish C. indica from Frenguelli’s C. patagonica. However, Raine (1987) figured more complete material from the Jurassic of the Manganui Valley in the North Island with the closely spaced pinnules and consistently once-forking venation as in C. indica. Most recently, Thorn (2001) listed Cladophlebis cf. C. australis from Kawhia Harbour in the North Island.
Cladophlebis species occur in the Jurassic of Hope Bay and Botany Bay, Antarctica. Following the pioneering work of Halle (1913) there have been two major works revising the floras, by Gee (1989) and Rees and Cleal (2004). Both recognised only one entire-margined species, Halle’s C. oblonga. Gee (1989) specifically regarded it as distinct from similar species elsewhere, such as C. australis, C. patagonica and C. indica.
A practical problem with the Catlins Coast material is that the venation is often faint and it is usually not straightforward to determine whether the veins dichotomise once or twice. Typically, the margins are also vague, and it is difficult to be sure that a slightly dentate margin is not an artefact of preservation. Despite this, the material I have collected appears to be entire-margined, with mostly singly-forking veins, but there are some that fork again. This later feature recalls Cladophlebis patagonica, although it is not restricted to the most basal veins as per Frenguellli (1947). However, many specimens have the remarkably long pinnules, and pinnules with a high length/width ratio, which Frenguelli associated with C. patagonica. In addition, most specimens have pinnules in which the base broadens apically. This feature is visible in Arber’s (1917, pl. 4, fig. 1) specimen that Frenguelli (1947) placed in C. patagonica, but is absent on Herbst’s (1966, 1971) specimen. Apically broadening pinnules were also associated with C. denticulata by both Gee (1989) and Birkenmajer and Ociepa (2008). However, both papers also agreed that the pinnule length/width ratio of C. denticulata was <3. Thus, even if the nature of the margin is obscure, the larger pinnule length/width ratio for the Catlins material rules out C. denticulata in most cases. In some of the Catlins Coast material the pinnae actually join to form a slight wing along the rachis, a feature noted for the Owaka Creek material by McQueen (1956). Raine’s (1987) North Island C. indica have a distinct wing between the pinnules, but do not show apically broadening pinnule bases. The concept of C. indica provided by Sahni and Rao (1933) was that the pinnules were mainly non-entire. However, the figures of the original Pecopteris indica (Oldham and Morris, 1863, pl. 27) do not show non entire margins, but many of the pinnules appear to overlap (similar to some extant New Zealand Blechnum) rather than be joined by a wing, and in the only figure showing a wing (2a) veins from adjacent pinnules meet in the sinus. These later two features suggest this material is distinct from any New Zealand fossils.
The present Catlins material agrees very well with that illustrated by Unger (1864) as Polypodium hochstetteri from the Waikato, a validly published name according to Mildenhall (1970). The drawing of this specimen appears to have taken care to show the sporadic second forking of veins, a wing between pinnules, and some apical broadening of the base.
Arber’s specimen with well-separated pinnules that Frenguelli used as the basis of Cladophlebis patagonica appears to be aberrant, and the specimen then chosen by Herbst (1971) to represent the species differs from the New Zealand material in its dense and strongly curved veins.
However, based on the pinnule shape, instances of doubly-forking venation, at least some of the Catlins coast material is regarded as Cladophlebis patagonica. None of the material is consistent with C. australis, although C. indica cannot be ruled out.
Cladophlebis patagonica Frenguelli, 1947 emend. Herbst, 1966
1886 Pecopteris obtusata Hector, fig. 30A (1).
1886 Pecopteris grandis Hector, fig. 30A (3).
1987 Cladophlebis indica (Oldham and Morris) Sahni and Rao; Raine, pl. 1, fig. 6.
1995 Cladophlebis australis (Morris) Seward; McLoughlin and Drinnan, p. 258, fig. 2F, fig. 3A, C.
2002 Cladophlebis sp. cf. C. patagonica Herbst McLoughlin et al. p. 15, fig. 9 A-E, fig. 10A.
Material. Black Point: LX0654, LX0655, LX1183, LX1184, LX1498, LX1499, Blue Cod Bay: LX0666, LX0680, Boat Harbour: LX1069, LX2070, Curio Bay: LX1074-1078, LX1080, LX1081, LX1083, LX1085-1089, LX1104, LX1226, LX1235, Haldane-Curio Bay Road: LX1213, Little Beach-01: LX1258, The Chasm: LX0660, Otara-21, Noted in the field, Otara-34: LX0683, LX1195, 1196, 1198, Owaka: LX0671, Slope-02: LX0684, LX1134, LX1135, 1136, 1139, 1197.
Description. Fronds tripinnate, c. 1 m long. Pinnae length to around 120 mm, pinnules subopposite lanceolate, length 13-33 mm, width 3-9 mm, L:W ratio 3.2-4.8, margin entire, apex acute, pinnule base broadening apically (Figure 4.1), margin decurrent on rachis apically and basally, margins of adjacent pinnules just touching on the rachis, or slightly out from it forming a wing (Figure 4.6), lateral veins dichotomising once, typically about one-third the distance from midrib to the margin, rarely a second time (Figure 4.5), midrib straight or slightly falcate, running smoothly to the apex, where its width becomes the same as the lateral veins.
Remarks. Despite the absence of fertile material, Cladophlebis patagonica most likely belongs in the Osmundaceae. In the Curio Bay - Slope Point region, permineralised stems attributed to Osmundaceae are common (Kidston and Gwynne-Vaughan, 1907-10; Miller, 1967; Tidwell, 1994) as are spores of the family in the palynological record of the area (Thorn, 2001) and the broader New Zealand Jurassic (Raine et al., 2011). Very similar (possibly conspecific, but typically placed in C. australis or in no species) sterile foliage in the Gondwana Jurassic is either regarded as Osmundaceae (e.g., Gould, 1974; McLoughlin and Drinnan, 1995) or kept as ‘family unknown’ (Gee, 1989; Rees and Cleal, 2004).
Family DICKSONIACEAE Schomburgk, 1848
Coniopteris and Sphenopteris
Remarks. Edwards (1934) maintained that “With the possible exception of Cladophlebis australis [Coniopteris] is the most abundant fossil in nearly all the New Zealand Jurassic localities...” However, the boundaries of the genus are vague, particularly with respect to Sphenopteris, from which Brongniart (1849) segregated Coniopteris. Some workers restrict the use of Coniopteris to fertile material and use Sphenopteris for sterile, whereas others have posed various morphological criteria for segregation. For example, Arber (1917) identified both sterile Coniopteris and Sphenopteris from the Catlins coast, although it is unclear what his distinguishing criteria were. He appears to have followed Seward (1904), quoting him that for Coniopteris hymenophylloides, “Venation and form of the frond [is] of the Sphenopteris type”. Other workers have cited various distinguishing characters, Medwell (1954, p. 86) wrote: “ Coniopteris tends to have more bluntly rounded lobes than Sphenopteris, but the distinction is small.” Douglas (1969, p. 85) considered that “Fertile S. warragulensis and Coniopteris specimens are easy to distinguish. The sori on the tips of the Coniopteris pinnules are much smaller and very rarely aggregated, and average about five per pinnule—S. warragulensis has one，rarely two sori per pinnule or indentation.” Gee (1989, p. 170) regarded Sphenopteris as “a form genus established for pinnules which are constricted at the base, often attached by a short stalk, elliptical in outline, with a margin lobed or toothed, with lateral veins that diverge from the relatively straight or flexuous midvein at low angles singly or in groups.” She used Coniopteris for similar, but fertile material. To McLoughlin and Drinnan (1995, p. 265) Sphenopteris was a “bipinnate frond and dissected pinnules with sinuous veins” and McLoughlin et al. (2002) described fertile Sphenopteris.
In the present work sterile material is regarded as Sphenopteris and fertile as Coniopteris. This follows Gee’s (1989) concept of Sphenopteris as a typical form genus, but Coniopteris as a ‘real’ genus. In reality, the Catlins species are probably forms of the same taxon.
The present material is similar to Arber’s Sphenopteris otagoensis and probably also to his sterile Coniopteris hymenophylloides. The Australian Sphenopteris travisii (Stirling, 1900; Drinnan and Chambers, 1986; McLoughlin et al., 2002) is regarded as identical and has priority. In terms of lobe shape and dissection, Catlins Sphenopteris do not compare well with any of the Hope Bay (Gee, 1989; Rees and Cleal, 2004) species. For instance, the pinnules are not reduced to wings of lamina surrounding the midvein and lateral veins as in S. bagualensis and S. nordenskjoeldii, but the basiscopic margins do taper gradually until they meet the proximal pinnule as per S. anderssonii. However, the pinnule lobes of S. andersonii appear much more rounded and more subdued on the basiscopic margin.
A single Catlins fertile specimen is regarded as Coniopteris. It has slightly narrower pinnules and pinnule lobes than Sphenopteris otagoensis and has a prominent round sorus at the end of each lobe. The form of the pinnules and aspect of the sori agree with C. murrayana as figured by Harris (1961). Furthermore, Gee (1989) identified Arber’s (1917, text fig. 9) similar fertile Curio Bay Coniopteris hymenophylloides as C. murrayana and regarded it as “identical” with material from Hope Bay. Guy-Ohlsen (1979) also reported C. murrayana from Curio Bay, and it is regarded as a cosmopolitan species. Rees and Cleal (2004) dealt differently with the Hope Bay material. They identified a C. cf. murrayana and kept fertile specimens that had been placed into C. hymenophylloides by Halle (1913) and Gee (1989), as informal species of Coniopteris. Specimens identified as C. cf. murrayana by Rees and Cleal shows deeply dissected lobes and fewer lobes per pinnule (5 as compared with c. 7).
The Coniopteris murrayana specimen and Sphenopteris otagoensis documented here occur in the same bed and probably belong to be the same ‘natural’ taxon.
Genus CONIOPTERIS (fertile) Brogniart, 1849
Coniopteris murrayana Brogniart, 1849
1917 Coniopteris hymenophylloides Arber, text fig. 9.
1989 Coniopteris murrayana (Brogn.) Brogniart, Gee, pl. 1, fig. 9.
Material. Slope Point-03: LX2066.
Description. Fertile secondary pinna, length unknown, at least 80 mm. Tertiary pinnae length up to 41 mm, width 10 mm, arising at an angle of 45-63°, tapering from base. Pinnules 8-9 mm long, 3-4 mm wide, arising at an angle of 60-65°, lobes slightly reduced, most bearing a terminal sorus (Figure 5.1). Sorus round, c. 0.8 mm diameter (the same width as the pinnule lobe).
Genus SPHENOPTERIS Sternberg, 1825
Sphenopteris travisii Stirling, 1900
1917 Sphenopteris otagoensis Arber, pl. 1, figs. 5, 6, 8.
1917 Coniopteris hymenophylloides Arber, pl. 2, figs. 1, 2, 3.
1986 Sphenopteris travisii Stirling, Drinnan and Chambers, p. 29, figs. 15H.
2002 Sphenopteris travisii Stirling ex Drinnan and Chambers; McLoughlin et al. p. 26, fig. 15.
Material. Black Point: LX1144-1146, LX1185, LX1186, LX1189, Blue Cod Bay: LX0665, LX1180, LX1181, Curio Bay: LX1100, LX1247, Slope Point-01: LX1138, Slope Point-03: LX2066, LX2067.
Description. Fronds sterile, pinnae c. 60 mm long, tapering gradually. Pinnules alternate, arising at an angle of 40-40°, 3-12 mm long, 1.2-4.7 mm wide, with two to three lobes on each side, tooth-like, with sharp apices, and separated by sharp sinuses. The acroscopic margin of pinnule is contracted, parallel to the pinna midrib. The basiscopic margin of each pinnule extends and narrows gradually toward its proximal neighbour forming a slight wing. Pinnule main vein decurrent on the main axis, with a zig-zag course within the pinnule and evanescing well before the pinnule apex.
Family DIPTERIDACEAE Seward and Dale, 1901
Genus HAUSMANNIA Dunker, 1846
Material. Otara-36: LX2361.
Description. Lamina presumably originally reniform, with a medial distal notch and other less prominent notches along the distal margin. Base truncate, at 90° to the petiole. Height 40 mm, preserved width 35 mm, indicating an original width of c. 70 mm. Sori not obvious. Petiole midvein bifurcates at the base, then at least three more times before the margin. Intervening lamina is divided into a reticulate, polygonal, mesh.
Remarks. On the basis of its reniform (or broadly fan-shaped) lamina, dichotomising major veins, and reticulate mesh of higher venation, a single specimen from Otara Beach is clearly a Hausmannia. Cantrill (1995) pointed out that Hausmannia is indistinguishable from extant Dipteris and is, therefore, best regarded as an organ-genus of Dipteris. He noted that extant Dipteris show such a wide range of morphology that “few taxa could be recognised in the fossil record,” although a few characters, including the degree of marginal lobing, could reliably distinguish species. Unfortunately, the margin of the new specimen is partially damaged, but what does remain indicates relatively shallow crenulations, with the exception of the apical sinus, clearly not deeply dissected. On that basis it is probably pointless to search for a “specific” match for the single specimen here, although the shape of the Otara Hausmannia compares favourably with fan-shaped Hausmannia from the Lower Cretaceous of Western Australia (McLoughlin, 1996; McLoughlin and Hill, 1996; McLoughlin and McNamara, 2001; Peyrot et al., 2019), and the Northern Territory (White, 1961). In contrast, it differs from the more distinctly reniform Middle Jurassic Hausmannia from the Clarence-Moreton Basin (Gould, 1980; McLoughlin and Drinnan, 1995) and the more deeply dissected Hausmannia wilkinsii from the Gilbert River Formation (Lower Cretaceous) of Cape York (Walkom, 1928).
Recent works covering the Dipteridaceae from the Australasian-Antarctic region include Herbst (1979), Rees (1993), Cantrill (1995) and Rees and Cleal (2004). The later reidentified all Dictyophyllum from the Antarctica Peninsula as Goeppertella, and Rees (1993) recognised Goeppertella from the New Zealand’s Clent Hills. Dictyophyllum has been reported from the Catlins in the past (Arber, 1917; Herbst, 1979), but not encountered during the present study. Future study may indicate they are also Goeppertella. Rees (1993) regarded Goepertella as stratigraphically significant—for instance using its presence in the New Zealand Clent Hills assemblage to argue for a Late Triassic or Early Jurassic age, in contrast to Oliver et al. (1982) who proposed a Middle to Late Jurassic age (although note the Hunter et al., 2005, reassessment of the Botany Bay Group as mid Jurassic).
Family EQUISETACEAE Michaux, ex De Candolle, 1804
Genus EQUISETUM Linnaeus, 1753
Equisetum laterale Philipps emend. Gould, 1968
1917 Equisetites nicoli Arber, p. 26, plate 3, fig. 2.
1934 Equisetites nicoli Arber; Edwards, p. 90, pl. 4, fig. 3.
1968 Equisetum laterale Gould, p. 157, figs. 2, 3; pl. 1, figs. 1-22; pl. 2, figs. 1-18.
1989 Equisetum laterale Philipps emend. Gould, Gee, p. 157, pl. 1, figs. 3, 4, 5, 6.
Material. Little Beach-04: LX1063-1067, Otara-20: Noted in the field, Otara-32: LX0657, Otara-33: LX0710-0712, Otara-34: LX0714-0716, 1496, 1497, Otara-35: LX2684, Owaka: LX0993-0995, 0999, 1001, 1003-1005, 1007-1010, 1166.
Description. Stems mostly 2.5-17 mm diameter (flattened), some specimens (LX1496) appear to be over 20 mm, c. 14 leaves in a whorl, 6.0 mm long, 1.5 mm wide (Figure 8.2). Nodal diaphragm c. 10 mm in diameter, with 29 ‘spokes’ (Figure 8.1).
Remarks. Two species of Equisetum have been described from the Southland Jurassic (as Equisetites), both of them falling within the Mesozoic group that has wheel-like nodal diaphragms (Harris, 1961). Arber (1917) described E. nicoli from the inland location of Mokoia. He compared it with the European E. laterale (as E. lateralis), saying “They may even be identical, though at present I should be inclined to regard them as specifically distinct.” Arber (1917, p. 26) never clearly stated what the differences were with E. laterale, but said “There are, however, several points of agreement with E. laterale. The...nodal diaphrams...are similar..., though probably not identical. There are fewer “spokes in the wheel” of the New Zealand fossil.” Arber did not describe the number of spokes, but his figures show about 18-19.
Subsequently, Edwards (1934) described Equisetum hollowayi from a “roadside cutting about ½ mile inland from Curio Bay.” It differed from E. nicoli in being “smaller in all of its parts” and “fewer and very much shorter leaves in the whorl and fewer “spokes” in the nodal diaphragm. The stems were less than 10 mm in diameter and diaphragms 2-4 mm in diameter with 9-14 spokes. Gould (1968) regarded E nicoli as “closely comparable” to E. laterale, a species that Gee (1989, p. 158) noted is “known from Mesozoic sediments all around the world, particularly in the Australasian area.”
The type horizon of Equisetum hollowayi has not been relocated, but Equisetum is present at other localities. A single diaphragm from the Otara coast has 29 “spokes” in the nodal diaphram which is about 10 mm in diameter. This nodal diaphragm is thus much larger than E. hollowayi and with more than twice the number of nodal spokes. Equisetites nicoli has a comparable nodal diaphragm diameter, although the number of spokes is slightly less. The present fossil is comparable to E. laterale in this respect. Given Arber’s (1917) vague criteria for why E. nicoli was distinct from E. laterale, plus the widespread nature of the latter as currently understood, it seems pragmatic to regard E. nicoli and the new material as E. laterale.
Equisteum fossils from the Miocene of New Zealand (Pole and McLoughlin, 2017) have much broader stems, many more leaves, and no diaphragms.
Class CYCADOPSIDA sensu Ruggiero et al., 2015
Order BENNETTITALES Engler, 1892 and CYCADALES Persoon ex Berchtold and Presl, 1820
Remarks. Although they have broadly similar external foliage morphology the ‘cycadophytes’ were recognised as including two unrelated groups, the Bennettitales and Cycadales, once cuticular morphology was employed. This has clarified the position of various genera, but rather than come up with a parallel system for dealing with remains without cuticle, attention has also focussed on morphological characters to differentiate them. There are now several slightly different approaches for this (Harris, 1969a; Person and Delevoryas, 1982; Gee, 1989, Watson and Sincock, 1992; Rees and Cleal, 2004). All include the leaflet base as an important character although Rees and Cleal (2004) emphasised venation as more reliable.
Genus OTOZAMITES Braun, 1843 emend. Watson and Sincock, 1992
Otozamites douglasii Drinnan in McLoughlin, Tosolini, Nagalingum and Drinnan, 2002
2002 Otozamites douglasii Drinnan; McLoughlin et al., p. 47, fig. 32.
Material. Black Point: LX1191, Blue Cod Bay: LX0679, 0681, Curio Bay: LX1229-1231, Otara-36: LX2362, Slope-01: LX0656, Slope-04: Noted in the field.
Description. Fronds elongate, over 200 mm long (Figure 9.1), pinnules adaxialy inserted, at around 60-70°, 13-14 mm long, 2.7-4.3 mm wide, apex acute, acroscopic margin straight or slightly concave, basiscopic margin convex (Figure 9.1), acroscopic margin of leaflet base slightly or distinctly auriculate (Figure 9.3, 4) and sometimes slightly imbricate (Figure 9.5), basiscopic pinnule edges distinctly contracted (Figure 9.3), veins 6-9, sometimes radiating from base (Figure 9.4), or acroscopic veins, either curving slightly acropetally, or running shortly to the margin.
Remarks. Several specimens have adaxialy inserted leaflet bases some of which are slightly imbricate at the base. These appear to be conspecific with what Arber (1917) illustrated as Ptilophyllum acutifolium. However, in neither case are basiscopic leaflet edges decurrent, but distinctly contracted (Figure 9.3), thus placement in Ptilophyllum is inappropriate (Halle, 1913; Harris, 1969; Watson and Sincock, 1992). In addition, the acroscopic margin of leaflet bases is slightly or distinctly auriculate (Figure 9.3), a character that is generally regarded as indicating Otozamites. Rees and Cleal (2004) cautioned that the leaflet bases could be distorted during taphonomic processes and that acroscopic veins curving acropetally was a more reliable character of Otozamites and would clarify any confusion with Zamites. There is no indication of leaftlet distortion in the Catlins material and, in the present specimens, the acroscopic veins either curve slightly acropetally, run shortly to the margin, but in one specimen (Figure 9.4), more clearly radiate. Thus, the material described here and Arber’s (1917) Ptilophyllum acutifolium are assigned to Otozamites, a move already suggested by Cantrill (2000). Rees and Cleal (2004) argued the distinction between Ptilophyllum and Otozamites was probably artificial and that they “likely belonged to a ‘natural’ genus.”
In terms of pinnule shape and venation, the closest morphological match of the Catlins material is with Otozamites douglasii from the Lower Cretaceous of Victoria (McLoughlin et al., 2002), and although epidermal details are needed to be sure, the Catlins material is assigned to that species. However, there may be more than one species. For example, the O. linearis illustrated from Antarctica by Gee (1989) tens to have a higher pinnule L/W ratio than the Catlins material, although Bomfleur et al. (2011) documented a wider range of pinnule shape. Those Otozamites differ from most of the Catlins Coast Otozamites in their strongly radiating veins. However, one fragmentary Catlins specimen does show distinctly radiating veins (and also has a more prominent auricle).
Genus PSEUDOCTENIS Seward emend. Watson and Sincock, 1992
Pseudoctenis? ensiformis Halle, 1913
1913 Pseudoctenis ensiformis Halle, pl. 6, fig. 8.
1917 Pterophyllum matauriensis Hector; Arber, p. 52, pl. 9, fig. 2, pl. 12, fig. 1.
1934 Pterophyllum matauraense Hector; Edwards, p. 99.
1989 Pseudoctenis ensiformis Halle; Gee, p. 24, pl. 5, fig. 18.
2004 Pseudoctenis ? ensiformis Halle; Rees and Cleal, p. 37, pl. 11, figs. 1-4, text fig. 4.
Material. Haldane-Curio Bay Road: LX1199-1207, LX1210, LX1212, LX1214, LX1215.
Description. Leaf apparently once pinnate, pinnae arising laterally on rachis. Rachis 1-3 mm wide. Pinnae alternate, arising at c. 90°, separate or connected by basal lamina. Pinnae separated by 3-12 mm away from the rachis. Pinna margins entire, near-parallel beyond the base. Pinna bases expanded basiscopically and acroscopically. Pinna apices unknown. Pinnae >45 mm long, width 6.5-9 mm beyond the base. Pinna venation prominent, 4-6 veins at pinna base, then commonly dichotomising, or sparsely anastomosing at varying distances from the rachis, to 8-9 veins across pinna width. Otherwise, veins. Basiscopic veins curving parallel to basiscopic margin, acroscopic veins parallel to acroscopic margin, then all becoming subparallel.
Remarks. A collection of frond fragments from a road cut behind Curio Bay have laterally inserted leaflets with expanded bases, both dichotomising and anastomosing veins and some striations on the rachis. On gross morphology these are likely the same species as Pterophyllum matauriensis, (Hector, 1886) and figured by Arber (1917), from the Mataura River, about 60 km inland from Curio Bay, although without mention of anastomosing veins.
Halle (1913) placed similar Jurassic material from Hope Bay, Antarctica, into Pseudoctenis ensiformis. He noted that Pseudoctenis has “occasional” anastomoses, Ctenis has regular anastomoses, whereas Pterophyllum has none. Halle (1913, p. 51) wrote that the characteristic feature of the Hope Bay material was the “widening of the pinnae at the base, both edges bending outwards and sometimes nearly joining those of the next lower and higher pinnae, thus forming a rounded sinus. To this feature corresponds a peculiarity in the course of the veins: the uppermost one or two veins in each pinna do not bend downwards when joining the rachis, as do the others, but upwards, parallel with the distal edge of the pinna.” These specific features and the overall form of his material are very similar to the Curio Bay material and are probably conspecific.
Gee’s (1989) treatment of the Hope Bay material agreed with Halle’s (1913) placement in Pseudoctenis. She drew attention to Pterophyllum medlicottianum from India (Bose and Banerji 1981) that was similar in “general aspect, but differing in its unforking veins.” However, Rees and Cleal (2004), working on additional Hope Bay material, and following Harris (1964, 1969a), stated that both Pseudoctenis (a cycad) and Pterophyllum (a bennettitalean) “rarely if ever show anastomosing veins.” They placed some Hope Bay material into Ctenis, especially because of its frequently anastomosing venation. However, this is quite dissimilar to the Curio Bay material in having lobed margins. They provisionally kept Halle’s (1913) taxon in Pseudoctenis but suffixed it with ‘?’ to indicate they could not be sure it was a true cycad. The material studied by Rees and Cleal (2004) showed “mainly simple veins” in contrast to Gee’s, which she said bifurcated “occasionally and unpredictably, from 0 to 4, usually 3, times per pinna, often at the pinna base.” Rees and Cleal (2004) emphasised the similarities of the Hope Bay material with the Indian Pterophyllum medlicottianum, but widened the net to two other species, Pt. footeanum and Pt. morrsianum, which only differed in having sporadic dichotomies. They argued there was a “strong possibility” that all four taxa would prove synonymous.
Following Thomas (1930), Watson and Sincock (1992) restricted Pterophyllum to species that have known Bennettitalean cuticle, and specifically excluded anastomosing venation in their diagnosis. More recent work on the genera includes Pott and Krings (2010), who noted that Ctenis and Pseudoctenis are “similar in macromorphology” but (following Seward, 1911) they were “easily distinguishable” on account of anastomoses in Ctenis. They also emphasised the striate nature of the rachis in Pterophyllum.
The Curio Bay material is very fragmented, but even in those fragments the dichotomies and anastomoses are apparent, and hardly “rare” (although the anastomoses are not common enough to regard them as a Ctenis). They appear to add to the evidence of Pseudoctenis ? ensiformis, Pterophyllum medlicottianum, Pt. Footeanum, and Pt. morrsianum being synonymous, with the degree of both dichotomies and anastomoses being variable. The Curio Bay material is regarded as Pseudoctenis ? ensiformis, following Rees and Cleal (2004).
Genus RINTOULIA McLoughlin, Tosolini, Nagalingum, and Drinnan, 2002
Rintoulia pectinata (Hector) McLoughlin, Tosolini, Nagalingum, and Drinnan, 2002
1917 Microphyllopteris pectinata (Hector) Arber, p. 40, pl. 7, figs. 3, 4, 6, 8, 10, 11.
1919 Microphyllopteris pectinata (Hector); Walkom, p. 186, pl. 8, figs. 1, 4.
1981 Pachydermophyllum pinnatum (Walkom) Retallack, p. 176.
2002 Rintoulia pectinata (Hector) McLoughlin, Tosolini, Nagalingum, and Drinnan.
Material. Curio Bay: LX1233, LX1238, Little Beach-03: LX1021, LX1029, Owaka: LX669.
Description. Frond elongate, > 30 mm long. Axis 1-1.7 mm diameter. Pinnules semicircular or ovate, attached by complete base to rachis, 1-5 mm long, 2-4 mm wide, separated by 0.5-1.0 mm.
Remarks. The ‘saga’ of this morphology highlights issues of trying to deal with fossils that have neither fertile structures nor cuticle. In this case the basic morphology has been attributed not only to several families of ferns, but also to gymnosperms. Arber (1917) considered that some New Zealand material would be “unhesitatingly” referred to Gleichenites by “most authors.” To him there was no doubt that the fossils were ferns and related to present-day Gleicheniaceae. But he regarded Gleichenites as a genus that was “incapable of being defined compactly and concisely.” He therefore introduced a new genus, Microphyllopteris, for fronds that had (among other characters) pinnules “very small, subcircular or ovate, closely set, broadest at the base, and attached by their whole base.” There was evidently a little uncertainty in his own mind at the generic limits of Microphyllopteris. He remarked on a specimen that he described as Microphyllopteris sp. from Owaka, that “It is possible that this specimen should be more correctly referred to the genus Thinnfeldia, though I am inclined to regard it as an example of Microphyllopteris, on account of the small size of the pinnules.” Arber (1917) then identified three species of Thinnfeldia (a gymnosperm) from Owaka, T. lancifolia, T. feistmanteli, and T. odontopteroides. There are probably intergradations of these Owaka ‘species’, and possibly with Microphyllopteris as well. Edwards (1934) suggested that some of Arber’s (1917) Microphyllopteris pectinata may even be Cladophlebis reversa. Since then, Doludenko (1971) and Doludenko et al. (1998) have placed Thinnfeldia into synonymy with Pachypteris.
Retallack (1981), placed several of Arber’s (1917, p. 40, pl. 2, fig. 10, pl. 7, figs. 3, 4, 6, 8, 10, 11 only) specimens of Microphyllopteris pectinata into Pachydermophyllum (as Pachydermophyllum pinnatum (Walkom) Retallack), a genus explicitly including cuticular details in its definition (Thomas and Bose, 1955). However, McLoughlin et al. (2002) subsequently placed most of Arber’s specimens into Rintoulia pectinata (Hector) McLoughlin, Tosolini, Nagalingum, and Drinnan. They excluded two specimens (Arber, 1917, pl. 7, figs. 5 and 9), which are at least twice pinnate. These two specimens compare with Archangelskya.
Nagalingum and Cantrill (2006) proposed that Gleichenia -like fern fronds should be classified in two genera: Gleicheniaceaephyllum, if they could be referred to the Gleicheniaceae, or Microphyllopteris, “for ferns that cannot be ascribed conclusively to Gleicheniaceae.” Microphyllopteris was then considered by Miller and Hickey (2008), who emended its diagnosis and suggested its use be restricted to true gleicheniaceous fronds.
Vera and Passalia (2012) argued that Microphyllopteris is illegitimate, as the type material had been reassigned by Rettalack (1981). They introduced a new fern genus Korallipteris, stating: “...since [Microphyllopteris] cannot be used for fossil ferns, we propose Korallipteris nov. gen. as a ‘‘replacement.”
Underlying much of this debate is an issue of intent - whether the material is thought to be a fern or a pteridosperm. In a strict sense, Microphyllopteris appears to have clear priority for material with semicircular pinnules, but which is sterile, has no cuticle, and higher affinities that are not known. However, in the interests of some stability, Rintoulia is used for the Catlins material, following McLoughlin et al. (2002).
Based on this concept of Rintoulia, it is common in both the Jurassic (Walkom, 1919, 1921; Jansson et al., 2008) and Early Cretaceous (White, 1961; Douglas, 1969; McLoughlin et al., 2002) of Australia and also appears to be present in the Lower Cretaceous of India (Sah, 1965; Bose and Sah, 1968). Note that on the basis of spores, the Gleicheniaceae were clearly present in the New Zealand Mesozoic (Raine, 2011).
Genus ARCHANGELSKYA Herbst emend. Rees and Cleal, 1993
Archangelskya furcata (Halle) Herbst emend. Rees and Cleal, 1993
2004 Archangelskya furcata (Halle) Herbst emend. Rees and Cleal; Rees and Cleal, pl. 22.
Material. Owaka: LX0672, LX0673.
Description. Frond bipinnate. Primary axis c. 2 mm diameter. Pinnules rhombic or almost fan-shaped attached by a narrow base. 8-11 mm long, 4-5 mm wide. Acroscopic basal margin contracted such that the basal, apical margin of the pinnule is more or less parallel to the axis, basiscopic basal margin decurrent, but not connecting to adjacent pinnule as a wing. Venation faint but appears to generally radiate from attachment.
Remarks. Two fragments from Owaka have the distinct pinnule shape of Archangelskya, and specifically with A. furcata (see Gee, 1989; Rees and Cleal, 2004; Parica et al., 2007). The pinnule shape is widely characterised as ‘polymorphic’.
Genus PACHYDERMOPHYLLUM Thomas and Bose, 1955
Pachydermophyllum austropapillosum (Douglas, 1969) McLoughlin and Nagalingum, 2002
2002 Pachydermophyllum austropapillosum (Douglas, 1969) McLoughlin and Nagalingum fig. 39.
Material. Little Beach-03: LX1014, The Chasm: LX0658, LX0659.
Description. Frond pinnate, elliptical in overall outline, with longest pinnules in the middle, > 50 mm long. Rachis prominent, with central ridge/depression. Pinnules 12-13 mm long, 2.3-3.8 mm wide, well-spaced, about 2.3-2.5 mm, attached laterally, at near right angles (c. 70-90°), connected by a narrow flange along the rachis, mostly straight, basiscopic margins prominently decurrent, acroscopic margins curving basally, margins roughly parallel, but crenulate, one central vein.
Remarks. Fronds at The Chasm are similar to Victorian Early Cretaceous material that Douglas (1969) placed in a new species, Pachypteris austropapillosa and which was later transferred to Pachydermophyllum by McLoughlin et al. (2002). Similar material (as Pachypteris) has also been listed in the Walloon Coal Measures (Gould, 1974, 1975, 1980; P. pinnata, P. cf. austropapillosa, P. crassa).
Family PENTOXYLACEAE Sahni, 1948
Genus TAENIOPTERIS Brongniart, 1832
Remarks. Taeniopteris is the second most common taxa of the Catlins coast. The use of Taeniopteris in the present work follows Harris (1932) and Rees and Cleal (2004), who reserve it for material lacking anatomical details, which might otherwise place it in genera such as Macrotaeniopteris, Nilssonia, Nilssoniopteris, or Nipaniophyllum. On this basis, Rees and Cleal (2004) placed their Hope Bay material in Taeniopteris.
Arber (1917) recognised four species of Taeniopteris in the New Zealand Jurassic: T. crassinervis, T. daintreei, T. thomsoniana, and T. vittata. These were based on features of venation—its conspicuousness, spacing, and whether the veins forked near the midrib or within the lamina. Edwards (1934) regarded T. daintreei (McCoy, 1875) as a mis-print for the older (McClelland, 1850) name of T. spatulata. He also suggested that Arber’s (1917) Curio Bay T. vittata were an extreme form of T. spatulata, although made no comment that T. vittata is an even older name. Mildenhall (1970) included both T. daintreei and T. spatulata in his list of valid names, but repeated Edwards’ (1934) point that T. daintreei was probably a misprint for T. spatulata. Since the reviews by Douglas (1969) and then Drinnan and Chamber (1985) of T. daintreei, this name has been widely used for Australasian material, although they did not specifically deal with the issue of T. spatulata.
The most widespread Taeniopteris in the Jurassic of the Catlins Coast (exemplified by material from Curio Bay) has leaf widths ranging from about 5 mm to at least 27 mm, but too few specimens are available from any single locality to recognise a mode. A quantitative study by Blaschke and Grant-Mackie (1976) documented distinctly different Taeniopteris widths in collections from the Jurassic of Port Waikato and Clent Hills. The narrower (mostly 3-13 mm) Port Waikato specimens were included in T. daintreei, and the wider (5-25 mm, mostly 10-22 mm) Clent Hills specimens into T. thomsoniana. Their use of T. daintreei instead of T. spatulata was apparently due to the linking of the later with the Pentoxylales, which they regarded as circumspect for the New Zealand material. However, this ought to be irrelevant for purely impression material. Their use of T. thomsoniana for the Clent Hills material follows Arber (1917). However, there are not clear morphological differences between the species described by Blaschke and Grant-Mackie (1976), and they probably could not be distinguished if they were found together.
As per Arber (1917), the most widespread Catlins Taeniopteris is referable to T. daintreei, whereas in the taxonomic scheme of Blaschke and Grant-Mackie (1976), a simple interpretation could place it into a broadly defined T. thomsoniana.
However, Taeniopteris spatulata has priority and is used in the present work. Taeniopteris vittata (Brongniart, 1828) is an even older name, but is ignored here as a Northern Hemisphere species. Person and Delevoryas (1982) and Rees and Cleal (2004) warned that Taeniopteris can exhibit a very broad range in size and were unimpressed with size as a criterion to distinguish species. The later maintained there was a gradation of Taeniopteris width in their Antarctic material from 9.5 up to 100 mm wide (although they did recognise two forms). This very large range of width encompasses the largest New Zealand Taeniopteris. Some early authors (e.g., Schimper, 1869; Feistmantel, 1877) placed relatively large leaves in Macrotaeniopteris. However, Arber (1905, 1917) maintained that size and shape alone were not sufficient to distinguish this (and other Taeniopteris -like taxa) and kept them all in Taeniopteris. Harris (1932) reserved Macrotaeniopteris for large leaves that had cycadean stomata. Hector (1886) figured a Macrotaeniopteris lata from Mataura Falls, but without a scale. The specimen was seen by Arber (1917) who noted the width as 66 mm, with about 10, mostly simple veins, per 10 mm of length. He placed this specimen, along with other material about 80 mm wide from Mataura, in T. crassinervis. Gupta’s (1986) review of T. crassinervis included Arber’s (1917) material in synonomy. He regarded T. crassinervis as most closely resembling T. lata Oldham (Oldham and Morris, 1863) in terms of size and shape, but gave three characters of the veins to distinguish them. A fragment with a width of about 100 mm from the Drumduan Group of Nelson was illustrated by Johnston et al. (1987) as T. cf. T crassinervis. The largest Taeniopteris specimens found in the current study are two superimposed leaves from Curio Bay that are about 58 mm wide. My personal preference is to continue to draw attention to these larger forms by recording them as T. crassinervis but recognising that they may simply be the extremes of T. daintreei/T. spatulata.
At the opposite end of the width scale, the Waikawa Syncline localities are dominated by a remarkably narrow Taeniopteris. It is often found as overlapping masses on bedding in massive sandstone boulders, making it both difficult to collect and poorly preserved. The widths range from about 2.5-4.0 mm, that is, comparable to only the very narrowest Taeniopteris widths cited by Blaschke and Grant-Mackie (1976), White (1981), and Rees and Cleal (2004) and also to “linear, needle-like” specimens in McLoughlin and Drinnan (1995, fig. 4E). The existence of this very thin morphology in a restricted stratigraphic range has clear stratigraphic and perhaps climatic/edaphic potential. However, here is no clear taxonomic precedent that appears to apply, and for the present, an informal name, T. sp. ‘narrow’ is applied.
Material. Blue Cod Bay: LX0667, Boat Harbour: LX2068, LX2069, Curio Bay: LX1227, LX1228, LX1233, LX1234, LX1236, LX1237, LX1240-1246, LX1248-1252, LX1277, LX1278, Little Beach-01: LX1059, LX1254-1257, LX1259-1270, LX1272-1274, LX1276, LX0831, LX1082, LX1097-1099, LX1106, LX1108-1110, LX1112-1128, LX1217-1225, Little Beach-03: LX1020, Otara-8: LX2363, Otara-34: LX1194, The Chasm: LX0662, LX1177, LX1178, LX1179.
Description. Leaves strap-like, margins entire, gradually increasing in width from the base, margins parallel in the central portion and converging rapidly to an acute apex. Veins dichotomising once, usually at apparently random points between midrib and the margin. Rarely dichotomising and anastomosing again. Mostly 11-22 veins per 10 mm of midrib (but one specimen has c. 50).
Taeniopteris crassinervis (Feistmantel) Walkom, 1917
1886 Macrotaeniopteris lata Hector, p. 66, fig. 30A (4).
1917 Taeniopteris crassinervis (Feistmantel); Arber, p. 45, pl. 9, fig. 4, pl. 10, figs. 1-3, 5.
1986 Taeniopteris crassinervis (Feistmantel) Walkom; Gupta, p. 195, figs. 2, 3.
Material. Curio Bay: LX2365.
Description. Leaves presumed strap-like, with entire margins, length probably > 200 mm, width c. 58 mm, midrib c. 2.0 mm wide, lateral veins at a high angle (c. 80°) to the midrib, 10-13 per 10 mm of midrib, dichotomising within the lamina, with vein density increasing to c.18 per 10 mm in mid-lamina.
Taeniopteris sp. ‘narrow’
Material. Little Bay-01: LX1059, LX1254, LX1261, Little Bay-03: LX2365, LX1020.
Description. Leaves elongate, with parallel, entire margins, length probably > 80 mm, width typically c. 2.5-4.0 mm, midrib 0.4 mm wide, lateral veins at high angle to midrib, but mostly unclear.
Class PINOPSIDA sensu Ruggiero et al., 2015
Remarks. In the absence of cuticle, placing coniferous foliage into taxa is a tenuous activity. The conifer foliage known from the Catlins Coast falls into at least four of the form-genera that were clarified by Harris (1969b). In the present study these include one that has elongate, single-veined leaves twisted into dorsi-ventral plane (i.e., distichous) placed into Elatocladus, one with broader leaves, multi-veined leaves placed into Podozamites, and one with small, scale-like leaves, placed in Pagiophyllum. In addition, Arber (1917, pl. 13, figs. 8, 10) figured shoots with the very short leaves of a typical Brachyphyllum.
Genus ELATOCLADUS Halle emend. Harris, 1979
Elatocladus confertus (Oldham and Morris) Halle, 1913
1913 Palyssia conferta Arber, p. 346, pl. 8, fig. 5.
1913 Elatocladus conferta Halle, pl. 8, figs. 26-40.
1917 Elatocladus confertus (Oldham and Morris) Halle; Arber, p. 58, pl. 1, figs. 1, 3, pl. 6, fig. 4, pl. 8, fig. 6.
1989 Elatocladus confertus (Oldham and Morris) Halle; Gee, p. 201, pl. 8, fig. 75.
2004 Elatocladus confertus (Oldham and Morris) Halle; Rees and Cleal, pl. 18, figs. 5, 6.
Material. Blue Cod Bay: LX0678, LX1147, LX1148, Curio Bay: LX1090, LX1102, LX1107, LX1169, Little Beach-01: LX0677, LX1050, LX1053, LX1055, LX1057, LX1058, LX1060, Otara-21: Noted in field, Otara-34: LX0686, Otara-31: LX0687, Otara-32: LX0694, Otara-33: LX0713, The Chasm: LX0661 LX1175, LX1176.
Description. Branching shoots > 80 mm long, with spirally inserted leaves on 1-2 mm diameter stem, distichously flattened. Around 6-8 leaves per 10 mm of stem, margins of adjacent leaves touching, or less than 0.5 mm apart. Leaves 6-9 mm long, 1.2-1.7 mm wide, bifacially flattened, falcate (reflexed, with mid portion of leaf arching apically), very elongate ovate, or with parallel margins in the middle, apices acute to rounded, base narrowed to a short false petiole, decurrent on stem, univeined, with vein running to apex.
Remarks. This is the most widespread conifer foliage type of the Catlins Coast Jurassic. Gee pointed out that Elatocladus confertus has reflexed leaves, and that this is a “fairly consistent character” to distinguish E. confertus from other Elatocladus species. Gee (1989), in her work on the Hope Bay material, clarified some of the characters present in these, or similar forms, and provided a key. This provides a basis to confirm the older New Zealand identifications and perhaps see if new species are present. One has thin, straight, narrow leaves, placed into E. planus. On the basis of epidermal information Townrow (1967) described a new taxon, Mataia podocarpoides, with affinities to Podocarpaceae, for a range of E. confertus material (the extant New Zealand conifer Prumnopitys spicata, Podocarpaceae, with Maori name ‘matai’, has similar foliage). The type locality was nominated as the Jurassic Clent Hills. However, there is no cuticular preservation there, and epidermal details come from material in the Upper Cretaceous strata in the Malvern Hills, New Zealand and from the Jurassic Walloon Coal Measures in Queensland, Australia (Note the error in Pole, 2009, where the cuticle was stated to come from the Clent Hills). The Catlins material may well be M. podocarpoides, but Mataia should be restricted to material with epidermal details. The E. confertus morphology has clearly been produced by various taxa (Frenguelli, 1949; Rao, 1964; Bose et al., 1982) and Podocarpaceae has been suggested as the affinity. In the Catlins Jurassic, given the common occurrence of permineralised wood with a structure consistent with Podocarpaceae (Crié, 1889; Arber, 1917; Edwards, 1934) and the common occurrence of broadly podocarpaceous pollen (Thorn, 2001; Raine et al. 2011) Podocarpaceae would seem likely. Edwards (1934) hinted at Elatocladus foliage being attached to a Palissya, a reproductive structure seeming more certainly coniferous, but with still unclear family affinities (Pattemore and Rozefelds, 2019, see below). On these grounds, the affinities of E. confertus remain open, and it is not placed here into any family here.
Elatocladus sp. A
Description. Detached shoots, up to at least 95 mm long, c. 1 mm diameter, with acroscopically-curving, single-veined, bilaterally flattened leaves, 6-12 mm long, 0.7-1.3 mm wide, strongly decurrent basal margin, spaced c. 2-3 mm along stem.
Remarks. Distinct in having acroscopically-curving leaves that are interpreted as bilaterally flattened. The short length of these leaves, and the branching, makes them apparently distinct from Bellarinea richardsii. However, they both occur in the same locality, and future collecting should seek to clarify that they are not an extreme morphology of the same taxon. The bilateral flattening is similar to the Cretaceous cheirolepid conifer Otwayia (Pole, 2000; Tosolini et al., 2015), although the falcate leaves are different. Palynology has established the existence of Cheirolepidiaceae in the Murihiku Group Jurassic (Raine and Pole, 1988; de Jersey and Raine, 1990), but the corresponding foliage in New Zealand is as yet unknown (it could be represented by some Pagiophyllum, cf. Tosolini et al., 2015).
Elatocladus sp B
?1917 Elatocladus sp. Arber, pl. 8, fig. 9.
Material. Blue Cod Bay: LX2077.
Description. Shoot with bifacially flattened, well-spaced (c. 3 mm), opposite leaves, to at least c. 20 mm long, 3 mm wide, narrowing to a false petiole (c. 1 mm long) from c. 2 mm from the base, tapering towards the apex, single-veined.
Remarks. A single specimen is distinct in its relatively large, apparently opposite leaves, distinctly narrowed at the base to a false petiole.
Genus BELLARINEA Florin, 1952 emend. Nagalingum Drinnan and McLoughlin, 2002
Bellarinea richardsii Nagalingum Drinnan and McLoughlin, 2002
1917 roots, Arber, pl. 10, fig. 4.
1934 Elatocladus plana (Feistmantel); Edwards, p. 103, pl. 5, fig. 3.
2002 Bellarinea richardsii Nagalingum Drinnan and McLoughlin, fig. 40E in McLoughlin et al. (2002).
Material. Curio Bay: LX1239, Little Beach-01: LX0675, LX0676, LX1052, LX1130, LX1156, LX1271, LX1275.
Description. Detached shoots, c. 90 mm long, axis c. 1 mm diameter, with spirally inserted leaves, probably distichously flattened. Leaves linear, straight or slightly inwardly curved, very elongate, up to 34 mm long, 0.7-1.0 mm wide, well-spaced, typically 3-6 mm apart, not narrowed at the base, probably decurrent basally, perhaps slightly expanded apically.
Remarks. This material is similar to one of the specimens illustrated by McLoughlin et al. (2002, fig. 40E) and Nagalingum et al. (2005, fig. 2B) as Bellarinea richardsii. Both show the well-spaced, very elongate, inflexed leaves, attached to the axis with no sign of narrowing to a false petiole, and in some cases, an apical margin at the base that curves apically. This is a distinctive morphology and may indicate the material is conspecific. Florin’s (1952) original concept of Bellarinea required epidermal information for identification. However, Nagalingum et al. (2005) emended the generic diagnosis to include the shoots being unbranched and, therefore, probably annually deciduous. This contrasted with typical Elatocladus that have branched shoots and rhythmic growth. This suggests it would be useful to recognise an additional conifer form genus to those of Harris (1969, 1979) with Elatocladus emended to cover branched shoots only (with the down-side that fragments would be harder to deal with). Despite the lack of epidermal information in the Catlins material, Bellarinea richardsii is used here to emphasise the morphological similarity with the Victorian material.
Genus PODOZAMITES Braun, 1843
Podozamites gracilis Arber, 1917
Material. Curio Bay: LX1084, LX109, Little Beach-04: LX1012.
Description. Shoots >70 mm long with alternately inserted leaves, c. 5-19 mm apart, possibly loosely distichously flattened. Leaves bifacially flattened, 33-46 mm long, 2-6 mm wide, bases narrowly acute, apices acute. Venation indistinct, but apparently parallel, with 3 veins in the narrowest leaves, to possibly 10 veins across the widest.
Remarks. Arber (1917) described Podozamites gracilis from Curio Bay. As the name suggests, the leaves were remarkably narrow, 4-5 mm wide, and in this width, there were 5-7 parallel veins. This is one of the narrowest Podozamites species known, being distinctly smaller than the typical Triassic-Jurassic Podozamites of the Northern Hemisphere (e.g., Pole et al., 2016). Some of the smallest species do overlap. Podozamites lanceolatus illustrated from the Late Triassic of China (Li, 1964, fig. 20.3) comes close.
Genus PAGIOPHYLLUM Heer, 1881
Description. Shoots c. 2-2.5 mm diameter, with spirally-inserted scale-like leaves 2-3 mm long, c. 0.5 mm wide.
Genus PITYOPHYLLUM Nathorst, 1897
Description. Extremely elongate leaves, c. 2 mm wide, but up to over 70 mm long, with either a midrib taking up about a third of the lamina width, or c. 3 longitudinal veins. Typically straight, sometimes falctae.
Remarks. These leaves are sometimes found in masses. If a form genus name is needed, Pityophyllum may be the most appropriate (Seward, 1919). They are also comparable to some specimens which have been published as detached microphylls of Isoetites (for example, McLoughlin et al., 2002, fig. 7E). This should be given serious consideration. However, until more positive evidence of them being Isoetites turns up, Pityophyllum is a ‘safer’ term. They could be seen as an extremely small Taeniopteris, although there is no sign of lateral veins, or perhaps individual Bellarinea leaves, although no intact shoots have been noted in association. Attention is also drawn to some that lie close to Palissya cones (see below) and may indicate the foliage of that taxon.
ARAUCARITES Presl in Sternberg, 1838
Araucarites cf. cutchensis Feistmantel, 1877
Material. Little Beach-02: LX2364, LX2367.
Description. Ovulate scale, cuneate, 13-20 mm long, 22-24 mm wide, maximum width c. 50-70 % of distance from base to apex. Lateral margins straight, distal margin curved. Ratio of scale length to maximum width 0.5-0.8. Seed scar wedge-shaped, located in central portion of scale, margin indistinct, but up to c. 3.5 mm wide,
Remarks. The specimens are compared with the widely-reported taxon Araucarites cutchensis.
The genus was discussed by Cleel and Rees (2003) who remarked that “some show ovuliferous-scales with a single ovule and a free distal ligule, which suggest that they belong to the Araucariaceae,” and although some authors place them in Araucaria, they preferred to assign isolated organs to Araucarites. This follows Rees and Cleal (2004) in assigning similar specimens from Hope Bay, Antarctica to this genus. They placed their material in Araucariaceae, whereas Gee (1989) regarded Hope Bay material as Araucaria. In the absence of cuticular details of the Catlins Coast foliage to confirm the presence of Araucaria, the more conservative Araucarites is preferred here. A ligule is not apparent on the Catlins material, although this may have been broken off. Edwards (1934) described, but did not figure, an araucarian cone scale from Curio Bay as Araucarites grandis Walkom. His specimen was 45 mm long by “a little under” 30 mm wide.
PALISSYA Endlicher, 1847
Palissya batrumi Edwards, 1934, emend. Pattemore and Rozefelds, 2019
1921? Stachyotaxus cf. S. elegans Nath.; Bartrum, p. 258.
1934 Palissya batrumi Edwards, p. 100, pl. 5, figs. 5, 6.
2019 Palissya batrumi Pattemore and Rozefelds, p. 197, fig. 10.
Material. Boat Harbour: LX2071, Curio Bay: LX1096, 1103, Little Beach-01: LX0721, Otara-20: LX2238, LX2239, Otara-22: LX2178.
Description. Cones, at least 90 mm long, 10-17 mm diameter. Cone axis 2-3 mm diameter, bearing helically-arranged, rhomboid bract/scales, 3-5 mm wide, 5-7 mm long, sub-perpendicular to the axis, then reflexed strongly apically. Each bract/scale with about four pairs of ovule/scale units on the adaxial surface, placed oppositely, along the bract/scale midline.
Remarks. Distinctive elongate cones have been placed in Palissya, a genus established on material from the Jurassic of Europe. Figure 23.1 exhibits the external morphology, other specimens are split, or weathered to reveal internal detail, In Figure 23.2, the apical portion has been split along the central axis, while in Figure 23.4, the external surface has been removed to clearly show the paired ovule/scale units. On the adaxial surface o.
Palissya was initially assumed to represent ovulate cones, probably coniferous. In fact, Edwards (1934) claimed to have found a Palissya attached to what seemed to be an Elatocladus conifer shoot. However, Parris et al. (1995) reviewed the New Zealand and Australian examples of Palissya (including material from Black Bay) and expressed doubt that they were from conifers. Schweitzer and Kirchner (1996) then made a case for Palissya being microsporangiate. Subsequently, some of the Australian Palissya were placed in Knezourocarpon (Pattemore, 2000) in Knezourocarponaceae, possibly with ginkgoalean or pteridospermous affinity. They concluded that other Australian and the New Zealand taxa, were probably new genera in the Knezourocarponaceae. Pattemore et al. (2014) concluded that all Australasian Palissya were distinct from the original Northern Hemisphere concept of the taxon. Most recently, Pattemore and Rozefelds (2019) emended the diagnosis of the New Zealand material, P. bartrumi, and emphasized a likely relationship within the conifers for the genus. Some comparison with extant Taxaceae and Podocarpaceae was noted.
In Antarctica, Palissya has been described from the Aptian of Snow Island, Antarctica (Cantrill, 2000), but has not been described from the Hope Bay or Botany localities (Gee, 1989; Rees and Cleal, 2004).
Contemporary global plate tectonic models place the New Zealand sector of Gondwana (i.e., the Western Province, Mortimer, 2004) in high latitudes c. 160 Ma (e.g., Wright et al., 2013, 78-82°S, Seton et al., 2012, place Fiordland and the NW Nelson area at about 80-85°S). However, the location of the Murihiku Terrane with respect to the Gondwanan foreland at the time is unclear. If, for example, it lay c. 600 km east of the current location of Brisbane at 160 Ma, its palaeolatitude was approximately on the Polar Circle (i.e., c. 66°, under both the Seton et al., 2012 and Wright et al., 2013 plate models), but conclusions based on marine fossils (Stevens, 1971, 1980) argue for a more mid-latitude position. In fact, the Catlins Coast flora is very similar to the middle or possibly late (Wainman et al., 2018) Jurassic Mutdapilly flora from the Walloon Coal Measures near Brisbane (McLoughlin and Drinnan, 1995, see below) which likely lay close to the Polar Circle (also based on the Seton et al., 2012 and Wright et al., 2013 plate models). However, Jurassic floral zones are likely to have been broad, and vegetation significantly to the north and south of the Walloon Coal Measures may have been equally similar. The presence of economically thick coal seams in the Walloon Jurassic, but the virtual lack of coal in the Catlins Jurassic might result from a broad difference in depositional environment, but it may also hint at a different palaeolatitude. The evidence remains unclear as to whether the Catlins Jurassic accumulated above or below the Polar Circle.
The distribution of the taxa by locality is summarised in Figure 24. The most widespread and commonest plants of the Catlins Coast Jurassic are Cladophlebis and Taeniopteris. These are locally abundant with Cladophlebis in particular covering bedding surfaces at some localities as a monospecific assemblage. Equisetum is more restricted, but where it does occur, tends to also form monospecific assemblages. With the exception of the Waikawa Syncline, the next most common taxon is the conifer Elatocladus, which can occur with both Cladophlebis and Taeniopteris. Other foliage taxa tend to be much less common.
Disturbance in the form of river avulsion events and volcanic eruptions are likely to have been relatively frequent. The abundance of Cladophlebis and Taeniopteris and infrequent conifers compared to Curio Bay may be a function of higher water tables, more disturbance, or both. Equisetum is not present within the Curio Bay forest beds but was reported from the Curio Bay-Haldane road cutting locality by Edwards (1934).
The evidence from fossil wood (Creber and Chaloner, 1985) clearly indicates an element of seasonality for the Catlins Jurassic, although exactly what contributed to this is less clear. Two of the fern taxa in the Catlins Jurassic help to very broadly constrain local temperatures. Osmundaceae are today mainly found in the tropics - although mostly in the upland regions, but extend into temperate latitudes, such as Sweden. Their long history and widespread nature suggest they could be reliable indicators of climate, with the current distribution suggesting a preference for relatively cool temperatures without cold extremes. Dipteridaceae have long been considered as indicating relatively warm temperatures (Barnard, 1973; Corsin and Waterlot, 1979), with the single extant genus (Dipteris) confined to the lowland tropics. At least seven genera of Dipteridaceae are recognised Choo and Escapa, 2018), with Mesozoic global generic diversity peaking at five (in four morphological groups, Cantrill, 1995; see also Choo et al., 2016) and local diversity being highest in mid-low latitudes and in humid conditions. For example, in the late Triassic, China had five genera with many species (Zhou et al., 2015), but in the Early Cretaceous, as the region dried, the genera decreased to just Hausmannia and Dictyophyllum. The very high palaeolatitude (>72°N) mid Cretaceous Grebenka Flora of Siberia has Hausmannia as the sole Dipteridaceae in conditions inferred to have been moist and frost-free (Spicer et al., 2002). In this case, the low diversity of Diperidaceae is likely to result from relatively cool temperatures. Hausmannia and Dictyophyllum thus appear to be the hardiest Dipteridaceae, and the (rare) presence of just these two in the Catlins Coast Jurassic is consistent with a relatively cool, but still frost-free conditions in the horizons they are found, consistent with a relatively high latitude position in a global greenhouse period. However, in the Jurassic-Early Cretaceous, Hausmannia only occurred in what were relatively northern latitudes of Australia (Gould, 1980; McLoughlin, 1996, McLoughlin and Drinnan, 1995; McLoughlin and Hill, 1996; McLoughlin and McNamara, 2001; Peyrot et al., 2019; Walkom, 1928; White, 1961), and argues against very high latitude.
Taeniopteris is generally thought to have had very thin leaves, and the leaves are often found in masses. These suggest a fast-growing leaf that was excised synchronously, i.e., deciduous. Including Taeniopteris, three of the Catlins Jurassic taxa have been suggested by other workers to have been annually deciduous. A Victorian species of Rintoulia, R. variablis (Douglas) McLoughlin and Nagalingum (2002), was suggested to have been deciduous by McLoughlin et al. (2002) based on its typical occurrence in leaf mats. They also suggested the conifer Bellarinea richardsii Nagalingum et al. (2005) was deciduous based on its unbranched fossil shoots, in contrast to the branched Elatocladus conferta, which suggested an evergreen habit. The factors determining the balance between evergreen and deciduous taxa in vegetation is a complex subject. Suffice to say that (based on the contemporary situation), seasonality, such as winter cold, or a dry season, is implicated when vegetation is predominantly deciduous (clear growth-rings on Catlins Coast fossil wood is clear evidence of some sort of seasonality). Either or both factors could have been present in the Catlins Jurassic. On a local scale, ecological niche can be important. For example, in boreal forests today, deciduous and evergreen taxa can co-exist, but with the faster-growing deciduous trees occupying a post-fire niche. Based on charcoal, fire was clearly a factor in the Catlins Jurassic, and some fire-mediated vegetation distribution was likely.
New Zealand did not have the large-leaved and multi-veined Podozamites that are so typical of many Northern Hemisphere assemblages. Instead, the P. gracilis (Arber, 1917) that was present has leaves even smaller than those of some Jurassic Northern Hemisphere single-veined conifers, for example Storgaardia (Harris, 1935). The small leaf size of both P. gracilis and the other single-veined leaf conifers suggests a sub-optimal climate. In addition, the small pinnules of Otozamites douglasii are further evidence of relative coolness. A size gradient of Otozamites pinnules from large-small with increasing latitude (and presumed decreasing temperature) has been documented for the Australian Early Cretaceous (McLoughlin et al., 2002). Thus, leaf size also suggests relatively cool conditions in the Catlins Jurassic.
Some major plant groups, which are still notably absent from the Catlins Coast Jurassic record, might also help constrain climate belts. For example, the Ginkgoales are common in Triassic and Early Cretaceous floras of Australia, but, like New Zealand, they are notably absent from Jurassic floras of the Hope Bay (Gee, 1989; Rees and Cleal, 2004) and Australia (Turner et al., 2009). Likewise, macrofossils of the Caytoniales are represented in the eastern Australian Jurassic (Gould, 1975; Turner et al., 2009; Jansson et al., 2008) and the Antarctic Peninsula (Rees and Cleal, 2004) but have not yet been recorded from New Zealand. The Lycophytes have a relatively poor macrofossil record in the Australian Jurassic-Lower Cretaceous (Lower Jurassic, Queensland - Jansson et al., 2008; Middle Jurassic, Queensland - Rigby, 1978; Upper Jurassic, NSW - White, 1986; Lower Cretaceous, WA - Walkom, 1944; McLoughlin, 1996; McLoughlin and McNamara, 2001; Lower Cretaceous, South Australia - Karrfalt, 1986; Lower Cretaceous, Queensland - Walkom, 1928), and despite their absence so far of macrofossils in the New Zealand record, their presence is clear from their palynomorphs (e.g., Thorn, 2001). Like Hausmannia, some of these groups may turn up eventually, or their absence might reflect preservation bias or unresolved stratigraphic issues.
The global climatic context of the Catlins Jurassic vegetation is the late Middle Jurassic ‘cool greenhouse’ world (some polar ice), but which including a possible ‘cold snap’ (Abbink et al., 2001; Jenkyns et al., 2002; Dromart et al., 2003; Kidder and Worsley, 2010, 2012; Donnadieu et al., 2011), followed by a ‘warm greenhouse’ world (no polar ice) in the early late Jurassic (summarised by Holz, 2015). In Upper Jurassic deltaic sediments of Port Waikato, Ballance (1988) noted what he termed ‘drop stones,’ which could have been dropped by either floating trees or by ice. He made the interesting observation that there was no sign of a strand facies and that there were few wave-generated structures. In the possible context of floating ice, he cited work on an Arctic delta, where ice damped wave action (Naidu and Mowatt, 1975). Petrographic work on the same region (Briggs et al., 2004) indicated that the sandstones were “texturally and mineralogically immature,” which they surmised either meant deposition close to source, or rapid transport from an environment where physical, rather than chemical weathering predominated. They added that the latter would be consistent with the “wet, cool, or cold temperate” conditions that they understood prevailed in the high latitude Gondwana Jurassic.
In apparent contrast to these cooler estimates, Clayton and Stevens (1967) and Stevens and Clayton (1971) used oxygen isotope data from New Zealand belemnite guards to infer sea water temperature. They obtained a wide range of temperatures, but they suggested slightly lower temperatures in the Late Jurassic than now and a mid-latitude position. Jenkyns et al. (2012) used the organic geochemical proxy TEX86 to derive sea surface temperatures for some Late Jurassic-Cretaceous high southern latitude sites. Their Late Jurassic data from DSDP Site 51 on the Falkland Plateau includes the late Callovian ‘cold snap’ of Holz (2015). Thus, these results should give an indication of minimum sea surface temperatures experienced at around 55-59 °S (palaeolatitude based on Müller et al., 2008; Seton et al., 2012). The minimum was around 25-26 °C, although as the authors pointed out, it may not be an absolute minimum, as the sample came from close to the base of the core. Samples from the rest of the Jurassic fluctuated around 27-29°C. The authors were under no doubt that this precluded glaciation at sea level in Antarctica, and (Jenkyns et al., 2012, p. 219) “the Southern Hemisphere was likely enjoying a tropical to sub-tropical climate that extended to high latitudes.” There may be no contradiction in these temperature estimates as Jurassic climate may have changed significantly over the timespan of the Catlins sequence considered here.
As regards rainfall, Pole (2001) surmised that the Middle Jurassic climate of the Curio Bay region was “relatively dry (i.e., less than humid, but not arid) and that rainfall was infrequent, perhaps seasonal.” Responding to this, Tidwell et al. (2013) asserted that “Coal beds abound in our study areas of Australia and New Zealand.” They appear unfamiliar with the geology of Curio Bay, where coal seams do not “abound,” but are absent, despite multiple soil horizons. Along the Otara coast an approximately 2-m thick unit of carbonaceous mud can grade into thin (a few cm) coal. There are also very thin, very carbonaceous muds at Boat Harbour. Tidwell et al. (2013) cited Thorn’s (2001, fig. 5) illustration of a tree stump in the Kawhia Harbour, North Island, that was rooted “at a coal-rich paleosurface” perhaps 10 mm thick, and the fact it grew in “a nearly identical flora, lacking only Donponoxylon ” as further evidence of a “moist environment” at Curio Bay. However, Kawhia Harbour is not Curio Bay, and Thorn (2001) only listed the foliage taxa Cladophlebis spp. (including C. cf. C. australis, and C. cf. denticulata), Taeniopteris daintreei, and Elatocladus conferta. That these taxa are generally ubiquitous simply suggests that they had broad ecological tolerances.
Tidwell et al. (2013) went on to cite the “osmundaceous fern bases, large conifer trunks, and of conifer tree stumps with shallow root systems” at Curio Bay as further indications of a “moist environment.” Without question the environment was ‘moist’, at least some of the time - it was a fluvial-lacustrine system after all. However, this is not the same as local rainfall. None of criteria applied by Tidwell et al. (2013) for a particularly humid climate are persuasive and, in my opinion, are outweighed by the remarkable lack of anything approaching coal at Curio Bay. Today, large conifers are a typical component of dry forests and Osmundaceae extend to areas of low annual rainfall. For example, Osmunda grows under conditions as dry as 500 mm mean annual rainfall, or less than 10 mm, or even 5 mm in the driest month [GBIF.org (15th July 2017) GBIF Occurrence Download http://doi.org/10.15468/dl.0vrg47]. However, other than the indication of lateral roots, in my opinion, the rooting system of the Curio Bay trees is unclear. They may genuinely lack deep tap roots and sinkers, as Tidwell et al. (2013) imply, but this is the typical situation for trees (Crow, 2005). Bannan (1940) reported shallow rooted conifers where the annual rainfall was about 748 mm and less than 50 mm in the driest month. Hytteborn et al. (2005) noted that pine roots shallow in response to dry and poor soils. Schenk and Jackson (2002) pointed out that absolute rooting depth tends to increase with annual precipitation. This appears to contrast with the argument presented by Tidwell et al. (2013) that shallow root systems indicate moist situations.
The lack of a definite palaeolatitude for the Murihiku Terrane precludes easily locating the region into global reconstructions of Jurassic climate and biomes (e.g., Parrish, 1991; Hallam et al., 1993; Rees et al., 2000). However, the bulk of evidence suggests relatively cool (and dry) conditions for the Catlins Jurassic, which would be consistent with a high latitude location, although likely much warmer than the present.
Broader Floristic Comparisons
The closest relationships of New Zealand’s Middle-Late Jurassic flora are with the Jurassic in eastern Australia and the Early Cretaceous of south-eastern and, to a lesser extent, with Western Australia. McLoughlin and Drinnan (1995) reported an assemblage from the middle or possibly late Jurassic of Mutdapilly, Queensland as containing Equisetum, Cladophlebis, Hausmannia, Sphenopteris, Taenopteris, Elatocladus, and Palissya, and they remarked that Waikawa (Curio Bay) was “strikingly similar” to their assemblage. However, one of the differences they noted was the absence of dipterideacean ferns from Curio Bay. With the discovery here of Hausmannia in strata broadly correlative with Curio Bay, that similarity is emphasised. The Early Jurassic Shaeffers Peak flora in Antarctica (Bomfleur et al., 2011) probably accumulated in the same general ‘neighbourhood’ as eastern Australia and the Catlins Coast. The dominant genera are reported as Equisetum, Coniopteris, and Otozamites. These are all present in the Catlins Coast, but the striking difference is in the absence of Cladophlebis and Taeniopteris.
Further afield, the decisive dating of the Botany Bay Group, on the Antarctica Peninsula, to the Middle Jurassic, c. 167 Ma (Hunter et al., 2005) is relevant, as this is equivalent to the New Zealand Temaikan and, therefore, of similar age to the Catlins Coast assemblages. Whether following Gee (1989) or Rees and Cleal (2004), the Antarctic material has a higher diversity, both in terms of species and genera, than the Catlins Coast. This might reflect a slightly lower latitude, and warmer, Antarctica Peninsula at the time. There is a broad similarity of genera, and discovery of Hausmannia in New Zealand is similar to the late recognition of this genus from the Antarctica Peninsula (Cantrill, 1995).
The similarity of the New Zealand Jurassic vegetation with that of other nearby Gondwanan areas is not surprising. However, the recognition here of floristic links with the early Cretaceous of Victoria (McLoughlin et al., 2002; Nagalingum et al., 2005), is less expected and suggests some long-term continuity of ecology. McLoughlin et al. (2002) documented the broad floristic and physiognomic trends across the Early Cretaceous of Australia, and also further afield to India. Victoria, with evidence for distinctly cold conditions, perhaps even periglacial (Constantine et al., 1998) was at higher latitudes (c. 70 °S) in the Early Cretaceous than the Walloon flora had been in the Jurassic. This suggests either a restriction of a cold-adapted flora to high latitudes, or some other mechanism in which polar environments linger as ‘relicts’ (see McLoughlin et al., 2002; Bomfleur et al., 2018).
The links between the Catlins Coast Jurassic and the Victorian Early Cretaceous may extend also to plant fossil associations. McLoughlin et al. (2002) recognised a range of facies-related floristic associations in the Victorian early Jurassic, based not only on the macrofosssil content, but also on palynology and mesofossils. Future work on the Catlins Coast palynology might be productive in this respect. At present but there are only vague hints of different macrofossil associations in the Catlins Jurassic with sedimentary facies. The forests of Curio Bay grew on a sand-dominated substrate, interpreted as mostly repeated unconfined flows, in relatively dry settings. The common taxa there are Elatocladus, Cladophlebis, and Taeniopteris. In-situ stumps suggest the latter two taxa grew within a coniferous forest. Along the Otara coast, the facies is distinctly different, with more mud, and thin beds of coal. It suggests a true flood-basin environment, where water tables were high and soils often water-logged. Muddy lithologies at Otara are commonly dominated by Cladophlebis and Taeniopteris, and locally with Elatocladus as well. However, the flora is not obviously distinct from Curio Bay. Cladophlebis and Taeniopteris may have had generalised ecologies that colonised broad areas of a fluvial landscape, either well-drained, sandy soils or more water-logged, clay-rich soils. The conifer component may have established itself below the initial canopy. It might be seen as a depauperate version of the Cladophlebis association (B3) of the Victorian Early Cretaceous, which was interpreted as occupying floodplains (McLoughlin et al., 2002). Elatocladus conferta -like foliage was absent in the Victorian early Cretaceous, and the only conifer in the Cladophlebis association was the needle-leaved Bellarinea.
The Little Beach assemblage shows some similarity to the Bellarinea-Taeniopteris-Rintoulia association (biofacies Bl) of McLoughlin et al., 2002, but still contains Elatocladus, Cladophlebis and Taeniopteris. It occurs in a fine, characteristically grey sandstone. Noda et al. (2002) included Little Beach within their meandering river and floodplain facies, but the characteristic features of a meandering system, such as epsilon cross-bedding, have not been recognised, and coal, which would support a flood basin interpretation, is absent. The presence of a floral association at Little Beach (Brothers Block, earliest Late Jurassic) distinct from that at Curio Bay (Slope Point Block, Middle Jurassic) is consistent both with the evidence of different ages and with inference of tectonic discontinuity between the two regions. The localisation of this flora in the axis of the Waikawa Syncline suggests it is the youngest Jurassic of the Murihiku Terrane.
Another floral association might be represented by the Owaka material. It is uniquely dominated by the very small-leaved Pagiophyllum, abundant Equisetum, as well as having Archangelskya. Unfortunately, the outcrop is very small and weathered, and little more can be said of it other than it appears to be generalised fluvial. In other instances, such as Otara, Equisetum probably formed monospecific patches in shallow, standing water.
Although Cheirolepidiaceae are known to have been a part of the Catlins vegetation based on pollen evidence, the associated foliage is not known, in part due to the lack of cuticle. This hampers closer comparison with the Victorian flora.
In the absence of clear facies control of these associations, the differences may be stratigraphic, and reflect climate differences. However, one other factor was likely an important agent of structuring the environment—fire. There is field evidence of abundant charcoal at several localities, and this is a focus of future research. Fires were likely to have had various ecological effects and may have discriminated between evergreen and deciduous taxa. Likewise, fire was an important component in the Early Cretaceous of Victoria (McLoughlin et al., 2002), although was curiously absent from all foliage-based associations.
Several of the taxa found in New Zealand (e.g., Cladophlebis, Hausmannia, Otozamites, Taeniopteris, Elatocladus) are shared with early Cretaceous assemblages in Western Australia (e.g., McLoughlin, 1996). However, the importance of these taxa being present is probably outweighed by other taxa which occur in Western Australia and not New Zealand (e.g., Phyllopteroides, Roebuckia and the short-leaved Araucaria, McLoughlin, 1996).
The strata of the Catlins Coast incorporate several beds in which plant macrofossils occur. The genera now recognised include Equisetum, Cladophlebis, Coniopteris, Sphenopteris, Rintoulia, Hausmannia, Archangelskya, Taeniopteris, Otozamites, Otozamites, Pseudoctenis ? Pachydermophyllum, ‘Palyssia’, Elatocladus, Bellarinea, Pagiophyllum, Pityophyllum, Podozamites, and Araucarites. Cladophlebis and Taeniopteris predominate, in some cases with Elatocladus and locally Equisetum is abundant. The other taxa are usually much less common.
Most of the facies were sandy and probably formed on relatively well-drained, seasonally dry, flash-flood prone alluvial plains. However, the Otara Coast preserves facies in which peat and muddy sediments were sometimes prominent, as flood-basin deposits. This environment may be contrasted with that of Curio Bay, higher in the regional section, where the environment was interpreted to be dominated by unconfined flashy fluvial flows, where sediments were poorly sorted and typically not muddy or peaty. However, both environments preserved a succession of fossil forests.
Beyond likely being in relatively high palaeolatitudes, the precise latitude is far from clear. However, there are several lines of evidence, including small leaves and at least three putatively deciduous taxa, which suggest relativity cool conditions, despite the global greenhouse conditions of the time. The floristic links are closest with eastern Australian Jurassic assemblages, but also with more distant parts of Gondwana, including Antarctica and India. Interestingly, there are links with the high-latitude Early Cretaceous of Victoria.
Special thanks to the McKenzie and Stratford families who have provided me with Southland hospitality and accommodation on my excursions over the years. Many thanks also to other ‘locals’, including the Cooks, Popes, Smiths, Watsons, and Ericsons, who, in true kiwi fashion, have freely given access over their land and to their knowledge of the country. Thanks also to A. Kemp and V. Leung for supporting my research. The comments of two reviewers greatly improved the paper and are much appreciated.
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