Shizukawa Area, Niranohama Formation, Honshu (Jurassic of Japan)

Where: Miyagi, Japan (38.7° N, 141.4° E: paleocoordinates 49.7° N, 152.7° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Niranohama Formation (Shizukawa Group), Hettangian (201.3 - 199.3 Ma)

• 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 40541: authorized by Martin Aberhan, entered by Sabine N├╝rnberg on 25.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Ostreida - Pteriidae
Pteria kitakamiensis Hayami 1958 pearl oyster
 Ostreida - Bakevelliidae
 Ostreida - Malleidae
 Arcida - Parallelodontidae
 Arcida - Cucullaeidae
 Mytilida - Mytilidae
 Trigoniida - Trigoniidae
Geratrigonia lata clam
possibly conspecific with G. hosourensis
Geratrigonia hosourensis Yokoyama 1904 clam
 Trigoniida - Myophorelloidae
 Carditida - Astartidae
 Cardiida - Neomiodontidae
 Cardiida - Cardiidae
 Thraciida - Thraciidae
 Poromyida - Cuspidariidae