Appendix 1.10.1
Seven rare and odd Tofino Basin ichthyolith subtypes are not the common triangular tooth shape or elasmobranch teeth or dermal denticles. They are included in this group and are not formally named or described in detail. Ichthyoliths are in CUIIS sequential order.
List of other Tofino Basin ichthyoliths|
Type |
Ichthyolith |
Figure no. |
|
a1/b1 |
Undescribed ichthyolith oddity, Form A |
101.1.1 |
|
a1/b1 |
Undescribed ichthyolith oddity, Form B |
102.1.1 and 102.1.2 |
|
a12/b1 |
Undescribed ichthyolith oddity, Form C, "globular dome" |
103.1.1 and 103.2.1 |
|
a12/b1,2,3 |
Undescribed ichthyolith oddity, Form D |
104.1.1 and 104.1.2 |
|
a12/b3 |
Undescribed ichthyolith oddity, Form E |
105.1.1 and 105.2.1 |
|
a12/b10 |
Undescribed ichthyolith oddity, Form F |
106.1.1 |
|
a15/b10+12 |
Undescribed ichthyolith oddity, Form G |
107.1.1 |
Undescribed ichthyolith oddity, Form A
Figure 101
a1/b1/c2
Remarks: This ichthyolith is asymmetric with a small unornamented cone apex and one widely developed flanged margin.
Occurrence: 1 specimen; offshore well Shell-Anglo Zeus D-14; middle Miocene.
Undescribed ichthyolith oddity, Form B
Figure 102
a1/b1/c3
Remarks: This ichthyolith is approximately triangular and has one curved projection on each face. One face is concave and the other is convex. The base is slightly flared and the apex is rounded and blunt.
Occurrence: 1 specimen; offshore well Shell-Anglo Prometheus H-68; Pliocene/Miocene.
Undescribed ichthyolith oddity, Form C, "globular dome"
Figure 103
a12/b1/c3/d0/e0/f0
Remarks: The tooth cap is globular dome-shaped; short (height<width); apex bluntly rounded; commonly circular or lobed/globular; commonly translucent; transverse line straight across; and subsurface is flat or concave. The tooth base is minimal; irregularly broken; and commonly wider than cap. The tooth is distinctive from other Cenozoic Tofino Basin subtypes, however, its features appear to be indistinguishable from Paleozoic specimens described by Tway (1983, figs 62 and 63).
Occurrence: 5 specimens, 3 questionable specimens; offshore wells Shell-Anglo Cygnet J-100, Prometheus H-68, and Zeus D-14; middle to upper Miocene and lower Pliocene; questionable specimens in the upper Eocene to lower Miocene.
Undescribed ichthyolith oddity, Form D
Figure 104
a12/b1,2,3/c3/d1/e2/f3
Remarks: An asymmetric dome-shaped tooth with a concave (bowled) subcrown and two short ridges on opposite margins and a possible third on another margin.
Occurrence: 1 specimen; offshore core END-76B-6C; ?Miocene.
Undescribed ichthyolith oddity, Form E
Figure 105
a12/b3/c1/d1/e1,3/f≤5
Remarks: A pyramidal to dome-shaped ichthyolith with an acute or rounded apex and ridges that diverge from the apex to the base. As many as six faces are on the ichthyolith bordered by the ridges.
Occurrence: 2 specimens; Hesquiat Peninsula and offshore well Shell-Anglo Pluto I-87; upper Eocene/Oligocene or reworked from older strata.
Undescribed ichthyolith oddity, Form F
Figure 106
a12/b10
Remarks: An asymmetric dome-shaped and rounded ichthyolith with an abundant pitted and stippled surface.
Occurrence: 1 specimen; offshore well Shell-Anglo Zeus D-14; middle to upper Miocene.
Undescribed ichthyolith oddity, Form G
Figure 107
a15/b10+12
Remarks: Possible bony fragments of a plated or bar-shaped tooth, with abundant pitted and rounded stipples, and well raised irregular ridges.
Occurrence: 3 specimens; offshore wells Shell-Anglo Zeus D-14 and Zeus I-65; middle to upper Miocene and Pliocene.
