Where: Tokyo, Japan (35.7° N, 139.2° E: paleocoordinates 44.4° N, 128.9° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Arai Formation, Triassic (251.9 - 201.4 Ma)

• Triassic (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 39668: authorized by Martin Aberhan, entered by Sabine Nürnberg on 02.06.2004

Creative Commons license: CC BY (attribution)