Where: Gumma, Japan (36.3° N, 138.7° E: paleocoordinates 35.4° N, 115.2° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Shionosawa Limestone Formation, Induan to Induan (252.2 - 247.2 Ma)

• Skytian

• formation-level stratigraphic resolution

Environment/lithology: marine; limestone

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 40486: authorized by Martin Aberhan, entered by Sabine Nürnberg on 24.06.2004

Creative Commons license: CC BY (attribution)