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Poronai, Hokkaidō Prefecture, Japan

Formation	Poronai
Age:	33.9 - 23.0 Ma Cenozoic
Interval	Late Eocene
Lithology	carbonate/mudstone, mudstone/"siliciclastic", siltstone, mudstone, mudstone/siltstone
Number of Collections	8
Number of Occurrences	51

Recorded Sample Locations

Location	Region	Stratigraphic Name
Seep facies	Mikasa City, Sorachi Subprefecture, Hokkaidō Prefecture, Japan	Poronai
MAJ 1	Mikasa City, Sorachi Subprefecture, Hokkaidō Prefecture, Japan	Poronai
Suidonosawa	Sorachi Subprefecture, Hokkaidō Prefecture, Japan	Poronai
Yayoi	Mikasa City, Sorachi Subprefecture, Hokkaidō Prefecture, Japan	Poronai
Kashima	Sorachi Subprefecture, Hokkaidō Prefecture, Japan	Poronai
Yayoi	Furano city, Kamikawa Subprefecture, Hokkaidō Prefecture, Japan	Poronai
Sukenebetsu	Rumoi Subprefecture, Hokkaidō Prefecture, Japan	Poronai

Recorded Fossils

Accepted Name	Type	Hierarchy	Age
Heptranchias ezoensis species	7	Animalia : Chordata : Chondrichthyes : Hexanchiformes : Hexanchidae : Heptranchias : *Heptranchias ezoensis*	38 - 33.9 Ma Paleogene
Pristiophorus lineatus species	7	Animalia : Chordata : Chondrichthyes : Pristiophoriformes : Pristiophoridae : Pristiophorus : *Pristiophorus lineatus*	38 - 33.9 Ma Paleogene
Glyptocidaris (Eoglyptocidaris) arctina species	7	Animalia : Echinodermata : Echinoidea : Calycina : Phymosomatidae : Glyptocidaris : *Glyptocidaris (Eoglyptocidaris) arctina*	33.9 - 23.03 Ma Cenozoic
Cyclocardia sp. genus	6	Animalia : Mollusca : Bivalvia : Carditida : Carditidae : *Cyclocardia*	37.2 - 33.9 Ma Paleogene
Conchocele conradii species	7	Animalia : Mollusca : Bivalvia : Lucinida : Thyasiridae : Conchocele : *Conchocele conradii*	37.2 - 33.9 Ma Paleogene
Conchocele taylori species	7	Animalia : Mollusca : Bivalvia : Lucinida : Thyasiridae : Conchocele : *Conchocele taylori*	37.2 - 33.9 Ma Paleogene
Malletia sp. genus	6	Animalia : Mollusca : Bivalvia : Nuculanida : Malletiidae : *Malletia*	37.2 - 33.9 Ma Paleogene
Portlandia sp. genus	6	Animalia : Mollusca : Bivalvia : *Portlandia*	48.6 - 37.2 Ma Eocene
Portlandia (Portlandia) sp. subgenus	6.3	Animalia : Mollusca : Bivalvia : Nuculanida : Sareptidae : Portlandia : *Portlandia (Portlandia)*	37.2 - 33.9 Ma Paleogene
Yoldia sp. genus	6	Animalia : Mollusca : Bivalvia : Nuculanida : Yoldiidae : *Yoldia*	37.2 - 33.9 Ma Paleogene
Acila sp. genus	6	Animalia : Mollusca : Bivalvia : Nuculida : Nuculidae : *Acila*	48.6 - 37.2 Ma Eocene
Acila (Truncacila) sp. subgenus	6.3	Animalia : Mollusca : Bivalvia : Nuculida : Nuculidae : Acila : *Acila (Truncacila)*	37.2 - 33.9 Ma Paleogene
Periploma sp. genus	6	Animalia : Mollusca : Bivalvia : Periplomatidae : *Periploma*	48.6 - 37.2 Ma Eocene
Hubertschenckia ezoensis species	7	Animalia : Mollusca : Bivalvia : Venerida : Vesicomyidae : Hubertschenckia : *Hubertschenckia ezoensis*	37.2 - 33.9 Ma Paleogene
Aturia yokoyamai species	7	Animalia : Mollusca : Cephalopoda : Nautilida : Aturiidae : Aturia : *Aturia yokoyamai*	38 - 33.9 Ma Paleogene
Bathyancistrolepis sp. genus	6	Animalia : Mollusca : Gastropoda : Neogastropoda : Buccinidae : *Bathyancistrolepis*	37.2 - 33.9 Ma Paleogene
Colus sp. genus	6	Animalia : Mollusca : Gastropoda : Neogastropoda : Buccinidae : *Colus*	37.2 - 33.9 Ma Paleogene
Neptunea sp. genus	6	Animalia : Mollusca : Gastropoda : Neogastropoda : Buccinidae : *Neptunea*	48.6 - 37.2 Ma Eocene
Euspira sp. genus	6	Animalia : Mollusca : *Euspira*	37.2 - 33.9 Ma Paleogene
Orectospira sp. genus	6	Animalia : Mollusca : Gastropoda : Turritellidae : *Orectospira*	37.2 - 33.9 Ma Paleogene
Turritella sp. genus	6	Animalia : Mollusca : Gastropoda : Turritellidae : *Turritella*	37.2 - 33.9 Ma Paleogene
Anomalina sp. genus	6	Chromista : Foraminifera : Globothalamea : Rotaliida : Anomalinidae : *Anomalina*	48.6 - 37.2 Ma Eocene
Bathysiphon sp. genus	6	Chromista : Foraminifera : Monothalamea : Astrorhizida : Rhabdamminidae : *Bathysiphon*	48.6 - 37.2 Ma Eocene
Globobulimina sp. genus	6	Chromista : Foraminifera : Globothalamea : Rotaliida : Buliminidae : *Globobulimina*	48.6 - 37.2 Ma Eocene
Elphidium sp. genus	6	Chromista : Foraminifera : Globothalamea : Rotaliida : Elphidiidae : *Elphidium*	48.6 - 37.2 Ma Eocene
Ammobaculites sp. genus	6	Chromista : Foraminifera : Globothalamea : Lituolida : Lituolidae : *Ammobaculites*	48.6 - 37.2 Ma Eocene
Haplophragmoides sp. genus	6	Chromista : Foraminifera : Globothalamea : Lituolida : Haplophragmoididae : *Haplophragmoides*	48.6 - 37.2 Ma Eocene
Cyclammina sp. genus	6	Chromista : Foraminifera : Globothalamea : Loftusiida : Cyclamminidae : *Cyclammina*	48.6 - 37.2 Ma Eocene
Dentalina sp. genus	6	Chromista : Foraminifera : Lagenida : Nodosariidae : *Dentalina*	48.6 - 37.2 Ma Eocene
Caucasina sp. genus	6	Chromista : Foraminifera : Globothalamea : Rotaliida : Caucasinidae : *Caucasina*	48.6 - 37.2 Ma Eocene
Gyroidina sp. genus	6	Chromista : Foraminifera : Globothalamea : Rotaliida : Gavelinellidae : *Gyroidina*	48.6 - 37.2 Ma Eocene

References

Kobayashi T. (1957) On an Aturia from the Poronai shale in Hokkaido, Transactions and Proceedings of the Paleontological Society of Japan, N.S. 27, 75-80

Nisiyama S. (1966) The echinoid fauna from Japan and adjacent regions, Part I, Palaeontological Society of Japan Special Papers 11, 1-277

Applegate S., Uyeno T. (1968)

Suzuki A. (2000) An Eocene cold-water molluscan assemblage from thr Poronai Formation in the Mikasa area, central Hokkaido, northern Japan, Earth Science (Chikyu Kagaku) 54, 363-368

Amano K., Jenkins R. G. (2007) Eocene drill holes in cold-seep bivalves of Hokkaido, northern Japan, Marine Ecology 28, 108-114

Amano K., Kiel S. (2007) Fossil Vesicomyid Bivalves from the North Pacific Region\r\n, The Veliger 49 4, 270-293

Hryniewicz K., Amano K., et al (2017) Thyasirid bivalves from Cretaceous and Paleogene cold seeps, Acta Palaeontologica Polonica 62 4, 705-728

Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!

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