Kawakami Area, Upper Yezo Group, Hokkaido (Cretaceous of Japan)

Where: Japan (43.1° N, 143.7° E: paleocoordinates 50.5° N, 135.6° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Upper Yezo Group, Coniacian (89.8 - 86.3 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; mudstone

• containing calcareous nodules

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 39903: authorized by Martin Aberhan, entered by Sabine N├╝rnberg on 12.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Pectinida - Anomiidae
 Protobranchia - Nuculanidae
Jupiteria (Ezonuculana) mactraeformis Nagao 1932 pointed nut clam