Okoppezawa River (Miocene of Japan)

Where: Hokkaido, Japan (42.8° N, 143.8° E: paleocoordinates 43.5° N, 142.1° E)

• coordinate stated in text

When: Ishiizawa Sandstone Member (Okoppezawa Formation), Langhian (16.0 - 13.8 Ma)

• Tanaka et al. [22] considered the geological age of the lower part of the Ishiizawa Sandstone Member where the holotype was obtained to be 16.3–13.5 Ma (the early middle Miocene) based on diatoms (Denticulopsis praelauta∼D. hyalina) [31] and nannofossils (N8–N13) [32] (figure 1).

Environment/lithology: marine; sandstone

Size class: macrofossils

Primary reference: W. Tonomori, H. Sawamura, T. Sato and N. Kohno. 2018. A new Miocene pinniped Allodesmus (Mammalia: Carnivora) from Hokkaido, northern Japan. Royal Society Open Science 5(5):172440 [M. Uhen/E. Holliday/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 188758: authorized by Mark Uhen, entered by Michael Hudgins on 16.09.2017, edited by Mark Uhen

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Carnivora - Desmatophocidae
Allodesmus uraiporensis n. sp. Tonomori et al. 2018 pinniped