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)
Taxonomic list
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