Where: Hokkaido, Japan (42.8° N, 142.1° E: paleocoordinates 46.9° N, 131.4° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Lower sandy Siltstone Member (Hakobuchi Formation), Early/Lower Maastrichtian (70.6 - 66.0 Ma)

• The middle portion of the lower sandy siltstone formation consists of dark gray sandy siltstone, bearing marine invertebrates such as Inoceramus (Cataceramus) shikotanensis, Pachydiscus (Neodesmoceras) japonicus and Neophylloceras hetonaiensis which indicate an early lower Maastrichtian age.

• bed-level stratigraphic resolution

Environment/lithology: marine; concretionary, gray, sandy, calcareous siltstone

Size class: macrofossils

Collected by S. Araki in 1980-1989 (exact date uncertain)

Collection methods: surface (float), surface (in situ), mechanical, acetic,

• Collection of Hobetsu Museum at Hobetsu-cho, Hokkaido, Japan

Primary reference: R. Hirayama and T. Chitoku. 1996. Family Dermochelyidae (superfamily Chelonioidea) from the Upper Cretaceous of north Japan. Transactions and Proceedings of the Palaeontological Society of Japan. New series 184:597-622 [R. Benson/R. Benson]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 129276: authorized by Roger Benson, entered by Roger Benson on 23.06.2012

Creative Commons license: CC BY (attribution)