Where: Nagano, Japan (36.5° N, 138.0° E: paleocoordinates 47.5° N, 147.8° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Tsuchizawa Formation (Kuruma Group), Pliensbachian (189.6 - 183.0 Ma)

• Pliensbachian (or thereabout)

• formation-level stratigraphic resolution

Environment/lithology: marine; siliciclastic sediments

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 40333: authorized by Martin Aberhan, entered by Sabine Nürnberg on 22.06.2004