Where: Yamaguchi, Japan (33.9° N, 131.3° E: paleocoordinates 43.9° N, 132.6° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Wakamiya Formation (Kwanmon Group), Early/Lower Cretaceous (145.0 - 100.5 Ma)

• Lower Cretaceous (precisely unknown)

• formation-level stratigraphic resolution

Environment/lithology: marine

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 40253: authorized by Martin Aberhan, entered by Sabine Nürnberg on 20.06.2004

Creative Commons license: CC BY (attribution)