Where: Ishikari, Japan (43.3° N, 142.0° E: paleocoordinates 50.3° N, 133.6° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Upper Yezo Group, Coniacian (89.8 - 86.3 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; mudstone

Size class: macrofossils

Preservation: cast, mold/impression

Primary reference: I. Hayami. 1975. A systematic survey of the Mesozoic Bivalvia from Japan. The University Museum, The University of Tokyo, Bulletin (10) [M. Aberhan/S. Nurnberg/S. Nurnberg]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 39824: authorized by Martin Aberhan, entered by Sabine Nürnberg on 07.06.2004

Creative Commons license: CC BY (attribution)