Soma Area, Koyamada Formation, Honshu (Cretaceous of Japan)

Where: Fukushima, Japan (37.8° N, 140.9° E: paleocoordinates 45.6° N, 143.1° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Koyamada Formation (Soma Group), Berriasian (145.0 - 139.8 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; shale and sandstone

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 40547: authorized by Martin Aberhan, entered by Sabine N├╝rnberg on 25.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Arcida - Parallelodontidae
 Pectinida - Entoliidae
 Carditida - Astartidae
 Pholadida - Corbulidae
"? Corbula globosa" = Varicorbula globosa
"? Corbula globosa" = Varicorbula globosa Sowerby 1818 clam
 Cardiida - Cardiidae
 Trigoniida - Myophorelloidae
Myophorella (Promyophorella) orientalis Kobayashi and Tamura 1955 clam