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Koetoi, Hokkaidō Prefecture, Japan

Formation	Koetoi
Age:	2.59 - 1.81 Ma Pleistocene
Interval	Gelasian
Lithology	mudstone
Number of Collections	3
Number of Occurrences	5

Recorded Sample Locations

Location	Region	Stratigraphic Name
Shupun-tou	Sōya Subprefecture, Hokkaidō Prefecture, Japan	Koetoi
Naipopochi	Sōya Subprefecture, Hokkaidō Prefecture, Japan	Koetoi
Kiyokawa Hidarimata Valley	Teshio gold-PGM placers, Kamikawa Subprefecture, Hokkaidō Prefecture, Japan	Koetoi

Recorded Fossils

Accepted Name	Type	Hierarchy	Age
Otariidae family	5	Animalia : Chordata : Mammalia : Carnivora : Otariidae	11.608 - 3.6 Ma Neogene
Delphinida infraorder	4.5	Animalia : Chordata : Mammalia : Cetacea : Delphinida	2.588 - 1.806 Ma Pleistocene
Archaeophocaena teshioensis species	7	Animalia : Chordata : Mammalia : Cetacea : Phocoenidae : Archaeophocaena : *Archaeophocaena teshioensis*	7.246 - 5.333 Ma Miocene
Miophocaena nishinoi species	7	Animalia : Chordata : Mammalia : Cetacea : Phocoenidae : Miophocaena : *Miophocaena nishinoi*	7.246 - 5.333 Ma Miocene
Phocoenoidinae subfamily	5.3	Animalia : Chordata : Mammalia : Cetacea : Phocoenidae : Phocoenoidinae	2.588 - 1.806 Ma Pleistocene

References

Tomida Y., Kohno N. (1992) Fossil marine mammals from the Koetoi Formation (middle late Miocene to early Pliocene) in Wakkanai City, Northern Hokkaido, Japan, Memoirs of the National Science Museum, Tokyo 25, 49-56

Murakami M., Shimada C., et al (2007) Some delphinoids (Mammalia: Cetacea) from the upper Miocene through the upper Pliocene of Hokkaido, Northern Japan, Journal of Vertebrate Paleontology 27 3, 122A

Murakami M., Shimada C., et al (2012) Two new extinct basal phocoenids (Cetacea, Odontoceti, Delphinoidea), from the Upper Miocene Koetoi Formation of Japan and their phylogenetic significance, Journal of Vertebrate Paleontology 32 5, 11472-1185

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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