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Neogene Benthic Foraminifera from the southern Bering Sea (IODP Expedition 323)

Eiichi Setoyama and Michael A. Kaminski

Plain Language Abstract

Foraminifera are unicellular amoeboid protists. Many groups of foraminifera produce a shell, or a test, that can be preserved as a fossil. High diversity, abundance, and ubiquity of foraminifera make them an important tool in various fields of Earth Sciences, such as stratigraphy, palaeoceanography, and palaeoclimatology. We carried out a detailed taxonomic analysis of 95 foraminiferal species found in the Pliocene–Pleistocene recovered by Integrated Ocean Drilling Program Hole 1341B drilled in the Bering Sea in order to provide a taxonomic guide for future foraminiferal research in the Bering Sea and surrounding North Pacific regions.

Resumen en Español

Foraminíferos bentónicos del Neógeno del sur del mar de Bering (IODP Expedición 323)

Este estudio describe un total de 95 taxones de foraminíferos bentónicos calcáreos del Plioceno-Pleistoceno recuperados del sondeo IODP Hole U1341B en el sur del mar de Bering, con ilustraciones realizadas con un microscopio óptico y SEM. Las asociaciones de foraminíferos bentónicos están dominadas principalmente por taxones calcáreos, y las formas aglutinadas poco diversificadas son raras o a menudo ausentes, las cuales comprenden únicamente los componentes menores. Los morfotipos infaunales que son alargados, cónicos, y/o aplanados planoespirales son comunes o dominan las asociaciones lo cual refleja la persistente alta productividad y las condiciones de hipoxia que se dan en las profundidades del mar de Bering. La mayor parte de las especies que se encuentran en los testigos son de largo alcance temporal, pero observamos la extinción de varias formas cilíndricas que desaparecieron durante la Transición Climática del Pleistoceno medio.

Palabras clave: mar de Bering; Bioestratigrafía; Foraminíferos; Paleoceanografía; Plioceno-Pleistoceno; Taxonomía

Traducción: Enrique Peñalver

Résumé en Français

Foraminifera benthiques néogènes du sud de la mer de Béring (Expédition IODP 323)

Cette étude décrit un total de 95 taxons de foraminifères benthiques à tests carbonatés provenant des sédiments plio-pléistocènes mis à jour par le sondage IODP U1341B dans le sud de la mer de Béring, avec des illustrations produites à l'aide d'un microscope optique et d'un microscope électronique à balayage (MEB). Les assemblages benthiques de foraminifères sont principalement dominés par des taxons à tests carbonatés, et des formes agglutinées peu diversifiées sont rares ou fréquemment absentes, ne représentant que des éléments mineurs. Les morphotypes endobiontes allongés, effilés, et/ou planispiralés aplatis sont communs ou dominent les assemblages, reflétant une productivité élevée et des conditions hypoxiques persistantes dans les milieux profonds de la mer de Béring. La plupart des espèces trouvées dans les carottes ont des répartitions stratigraphiques importantes, mais nous observons l'extinction de plusieurs formes cylindriques qui disparaissent pendant la transition climatique du Pléistocène moyen.

Mots-clés : mer de Béring ; biostratigraphie ; Foraminifera ; paléocéanographie ; Pliocène-Pléistocène ; taxonomie

Translator: Antoine Souron

Deutsche Zusammenfassung

Neogene benthische Foraminiferen aus der südlichen Bering See (IODP Expedition 323)

Diese Untersuchung beschreibt insgesamt 95 kalzitische benthische Foraminiferen-Taxa aus dem Plio-Pleistozän aus der IODP Bohrung U1341B in der südlichen Bering See mit Illustrationen, erstellt mit Lichtmikroskop und SEM. Die benthischen Foraminiferen-Assemblagen sind überwiegend von kalzitischen Taxa geprägt und wenig diversifizierte agglutinierte Formen sind selten oder fehlend und umfassen nur geringfügige Mengen. Längliche, kegelförmige und/oder planspirale infaunale Morphotypen sind häufig oder dominieren die Assemblagen. Sie spiegeln eine anhaltende hohe Produktivität und hypoxische Bedingungen der tiefen Bering See wieder. Die meisten der in den Bohrungen gefundenen Arten sind langlebig, wir konnten jedoch ein Aussterben einiger zylindrischer Formen während des mittelpleistozänen Klimawechsels beobachten.

Schlüsselwörter: Bering See; Biostratigraphie; Foraminifera; Paläoozeanographie; Plio-Pleistozän; Taxonomie

Translator: Eva Gebauer

Arabic

462 arab

Translator: Ashraf M.T. Elewa

 

 

author2Eiichi Setoyama
Earth Sciences Department
Research Group of Reservoir Characterization
King Fahd University of Petroleum & Minerals
Dhahran, 31261
Saudi Arabia
current address: Energy & Geoscience Institute
University of Utah
423 Wakara Way, Suite 300
Salt Lake City, Utah 84108
USA
This email address is being protected from spambots. You need JavaScript enabled to view it.

Eiichi Setoyama is currently working as a biostratigrapher at Energy and Geoscience Institute, University of Utah. He received his Ph.D. degree from the Institute of Geological Sciences, Polish Academy of Sciences, and was formally a postdoctoral researcher at King Fahd University of Petroleum and Minerals. His main area of expertise is in Cretaceous to Cenozoic deep-water benthic foraminifera.

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Michaelauthor1 A. Kaminski
Earth Sciences Department
Research Group of Reservoir Characterization
King Fahd University of Petroleum & Minerals
Dhahran, 31261
Saudi Arabia
This email address is being protected from spambots. You need JavaScript enabled to view it. 

Mike Kaminski is currently an Associate Professor at King Fahd University of Petroleum and Minerals in Saudi Arabia. He received his Ph.D. from the WHOI/MIT Joint Program in Oceanography, and was a postdoctoral researcher at Dalhousie University, and at GEOMAR before taking up a lectureship at University College London, where he taught on the MSc Course in Micropalaeontology. He was a shipboard scientist on three Integrated Ocean Drilling Program (IODP) expeditions, and participated as a shore-based participant for several additional IODP expeditions. He is a co-founder of the Grzybowski Foundation and the International School on Foraminifera. His main area of expertise is with the classification, biostratigraphy, and ecology of Agglutinated Foraminifera.

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FIGURE 1. Location of Site U1341 in the Bering Sea. The map is adopted and modified from Expedition 323 scientists (2011).

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FIGURE 2. Stratigraphic ranges of selected species in Hole 1341B. The ages are based on bioevents of diatoms (Onodera et al., 2013).

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FIGURE 3. All scale bars are 100 µm. 1. Pyrgo murrhina, 13H-3, 146-148 cm; a. lateral view; b. apertural view. 2. Pyrgo sp. A, 13H-3, 146-148 cm; a. lateral view; b. apertural view. 3. Triloculina cf. Triloculina trihedra, 9H-5, 146-148 cm; a. lateral view; b. apertural view. 4. Bolivina seminuda, 3H-CC, lateral view. 5. Bolivina sp. A, 36H-CC; a. lateral view; b. edge view showing the asymmetrically positioned aperture. 6. Brizalina pacifica, 11H-5, 146-148 cm; a. lateral view; b. edge view. 7. Brizalina panayensis, 1H-CC; a. lateral view; b. edge view. 8. Bolivinita quadrilatera, 61X-5, 115-117 cm; a. lateral view; b. edge view showing the asymmetrically positioned aperture. 9. Takayanagia cf. Takayanagia cushmani, 1H-CC; a. ventral view showing the tooth plate; b. dorsal view; c. edge view. 10. Rutherfordoides tenuis, 10H-3, 146-148 cm; a. ventral view; b. dorsal view. 11. Globocassidulina neomargareta, 9H-5, 146-148 cm; a. ventral view; b. apertural view showing the tooth plate; c. dorsal view; d. edge view. 12. Globocassidulina subglobosa, 13H-3, 146-148 cm; a. ventral view; b. dorsal view; c. edge view. 13. Islandiella helenae, 12H-3, 146-148 cm; a. ventral view; b. ventral view in immersion; c. dorsal view; d. edge view. 14. Globocassidulina sp. A, 3H-CC; a. ventral side, b. dorsal side, c. edge view.

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FIGURE 4. All scale bars are 100 µm. 1. Takayanagia delicata, 1H-CC; a. ventral view; b. dorsal view; c. edge view. 2. Eubuliminella exilis, 1H-CC, lateral view. 3. Eubuliminella cf. Eubuliminella exilis, 1H-CC, lateral view. 4. Fursenkoina complanata, 1H-CC, a. lateral view; b. edge view. 5. Bulimina rostratiformis, 8H-3, 146-148 cm; a. lateral view; b. apertural view. 6. Bulimina spicata, 62X-5, 146-148 cm, lateral view. 7. Globobulimina affinis, 8H-CC, lateral view. 8. Globobulimina auriculata, 25H-CC, lateral view. 9. Globobulimina barbata, 8H-3, 146-148 cm; a. lateral view; b. apertural view. 10. Globobulimina barbata, 52H-CC, lateral view. 11. Globobulimina cf. Globobulimina pacifica, 8H-CC, lateral view. 12. Globobulimina cf. Globobulimina spinenscens, 61X-5, 115-117 cm; a. lateral view; b. apertural view. 13. Globobulimina ovata, 18H-3, 146-148 cm; a. lateral view; b. apertural view. 14. Globobulimina ovata, 36H-5, 148-150 cm, lateral view. 15. Uvigerina peregrina, 1H-CC; a. lateral view; b. apertural view. 16. Uvigerina peregrina, 3H-CC; a. lateral view; b. apertural view. 17. Uvigerina proboscidea, 12H-3, 146-148 cm; a. lateral view; b. apertural view. 18. Uvigerina proboscidea, 14H-CC, lateral view. 19. Uvigerina senticosa, 7H-CC, lateral view. 20. Uvigerina senticosa, 14H-CC; a. lateral view; b. apertural view. 21. Uvigerina interruptacostata, 3H-CC; a. lateral view; b. apertural view. 22. Uvigerina interruptacostata, 8H-3, 146-148 cm, lateral view. 23. Rutherfordoides erectus, 1H-CC; a. lateral view view; b. edge view. 24. Siphonodosaria sp. A, 36H-5, 148-150 cm, lateral view.

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FIGURE 5. All scale bars are 100 µm. 1. Valvulineria cf. Valvulineria sadonica, 4H-CC; a. dorsal view; b. ventral view; c. edge view. 2. juvenile form of Islandiella helenae ?, 1H-CC; a. ventral view; b. dorsal view; c. edge view. 3. Alabaminella weddellensis, 13H-3, 146-148 cm; a. dorsal view; b. ventral view; c. edge view. 4. Cibicidoides mundulus, 18H-3, 146-148 cm; a. ventral view; b. dorsal view; c. edge view. 5. Cibicidoides simplex, 1H-CC; a. ventral view; b. dorsal view; c. edge view. 6. Parrelloides healdi, 1H-CC; a. dorsal view; b. ventral side view; c. edge view showing the pore-like aperture. 7. Parrelloides healdi, 25H-5, 146-148 cm; a. spiral view; b. umbilical view; c. edge view showing the pore-like aperture. 8. Epistominella pulchella, 4H-CC; a. spiral view; b. umbilical view; c. edge view showing the elongate arch aperture. 9. Laticarinina pauperata, 52H-CC. 10. Cibicidoides wuellerstorfi, 10H-3, 146-148 cm; a. ventral view; b. dorsal view; c. edge view. 11. Nonionella digitata, 9H-5, 146-148 cm; a. dorsal view; b. edge view; c. ventral side.

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FIGURE 6. All scale bars are 100 µm. 1. Nonionellina labradorica, 3H-CC; a. lateral left view; b. edge view. 2. Nonionellina cf. Nonionellina labradorica, 15H-5, 146-148 cm; a. lateral left view; b. edge view. 3. Astrononion stellatum, 10H-CC; a. lateral fight view; b. lateral left view; c. edge view. 4. Melonis affinis, 1H-CC; a. lateral left view; b. edge view. 5. Melonis affinis, 9H-5, 146-148 cm. 6. Melonis pompilioides, 1H-CC; a. lateral left view; b. edge view. 7. Pullenia bulloides, 11H-3, 146-148 cm; a. lateral left view; b. apertural view. 8. Pullenia bulloides, 12H-3, 146-148 cm; a. lateral left view; b. apertural view. 9. Pullenia cf. Pullenia catalinaensis, 36H-CC; a. lateral left view; b. edge view. 10. Pullenia cf. Pullenia catalinaensis, 9H-5, 146-148 cm; a. lateral left view; b. edge view. 11. Pullenia elegans, 13H-3, 146-148 cm; a. lateral right view; b. edge view. 12. Pullenia elegans, 13H-3, 146-148 cm; a. lateral left view; b. edge view. 13. Pullenia salisburyi, 26H-5, 147-149 cm; a. lateral left view; b. edge view. 14. Chilostomella ovoidea, 2H-CC, a. ventral view; b. dorsal view. 15. Chilostomella cf. Chilostomella fimbriata, 10H-3, 146-148 cm; a. lateral right view; b. edge view.

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FIGURE 7. All scale bars are 100 µm. 1. Quadrimorphina laevigata, 13H-3, 146-148 cm; a. dorsal view; b. ventral view; c. edge view. 2. Oridorsalis umbonatus, 3H-CC; a. dorsal view; b. ventral view; c. edge view. 3. Gyroidina ? sp. A, 36H-5, 148-150 cm; a. dorsal view; b. ventral view; c. edge view. 4. Gyroidina ? sp. A, 36H-CC; a. dorsal view; b. ventral view; c. edge view. 5. Hansenisca sp. A, 9H-3, 146-148 cm; a. dorsal view; b. ventral view; c. edge view showing a basal slit aperture. 6. Hansenisca sp. A, 16H-3, 146-148 cm; a. dorsal view; b. ventral view; c. edge view showing a low arch aperture. 7. Epelistoma sp. A, 63X-3, 146-148 cm, lateral view. 8. Lenticulina sp. A, 26H-5, 147-149 cm; a. lateral left view; b. edge view. 9. Lenticulina sp. B, 62X-5, 146-148 cm; a. lateral left view; b. edge view. 10. Hemirobulina sp. A, 9H-5, 146-148 cm; a. lateral left view; b. edge view. 11. Reussoolina apiculata, 28H-CC, lateral view. 12. Lagena cf. Lagena tagusensis, 12H-3, 146-148 cm; a. lateral view; b. apertural view. 13. Lagena striata, 10H-3, 146-148 cm; a. lateral view; b. apertural view. 14. Oolina squamosa, 10H-3, 146-148 cm; a. lateral view; b. apertural view. 15. Glandulina ovula, 36H-5, 148/150 cm, lateral view.

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FIGURE 8. All scale bars are 100 µm. 1. Bolivina sp. A, 1H-CC, lateral view. 2. Brizalina pacifica, 3H-CC, lateral view. 3. Brizalina panayensis, 3H-CC, lateral view. 4. Takatanagia cf. Takayanagia cushmani, 1H-CC, lateral view showing the apertural plate. 5. Rutherfordoides tenuis, 16H-5, 146-148 cm, lateral view. 6. Islandiella helenae, 13H-3, 146-148 cm, lateral view. 7. Eubuliminella exilis, 1H-CC, lateral view. 8. Eubuliminella cf. Eubuliminella exilis, 3H-CC, lateral view. 9. Fursenkoina complanata, 3H-CC, lateral view. 10. Globobulimina cf. Globobulimina spinescens, 61X-5, 115-117 cm, lateral view. 11. Uvigerina proboscidea, 59X-3, 145-147 cm, lateral view. 12. Uvigerina senticosa, 8H-5, 146-148 cm, lateral view. 13. Rutherfordoides erectus, 1H-CC, lateral view. 14. Siphonodosaria ? sp. A, 36H-5, 148-150 cm, lateral view. 15. Siphonodosaria ? sp. B, 13H-5, 146-148 cm, lateral view. 16. Stilostomella fistuca, 36H-CC, lateral view. 17. Laticarinina pauperata, 61X-CC, lateral view. 18. Nonionella digitata, 3H-CC, lateral view. 19. Nonionellina labradorica, 3H-CC, lateral view. 20. Nonionellina cf. Nonionellina labradorica, 3H-CC, lateral view. 21. Elphidium batialis, 3H-CC, lateral view. 22. Lotostomoides calomorphum, lateral view. 23. Neugeborina longiscata, 16H-5, 146-148 cm, lateral view. 24. Laevidentalina californica, 26H-CC, lateral view. 25. Laevidentalina sp. A, 36H-5, 148-150 cm, lateral view. 26. Mucronina sp. A, 61X-CC, lateral view. 27. Astacolus sp., 22H-CC, lateral view. 28. Procerolagena gracillima, 16H-5, 146-148 cm, lateral view. 29. Lagena hispidula, 13H-5, 146-148 cm, lateral view. 30. Lagena striata, 8H-3, 146-148 cm, lateral view. 31. Oolina squamosa, 9H-5, 146-148 cm, lateral view. 32. Parafissurina caledoniana, 8H-CC, lateral view.

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Counts of specimens (available in electronic format).