Where: Okayama, Japan (34.8° N, 133.7° E: paleocoordinates 45.8° N, 130.8° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Nariwa Group, Norian (221.5 - 205.6 Ma)

• 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 40249: authorized by Martin Aberhan, entered by Sabine Nürnberg on 20.06.2004