Where: Ishikari, Japan (43.3° N, 142.0° E: paleocoordinates 51.3° N, 134.7° E)
• coordinate estimated from map
• local area-level geographic resolution
When: Mikasa Sandstone Formation (Middle Yezo Group), Turonian (93.9 - 89.8 Ma)
• formation-level stratigraphic resolution
Environment/lithology: foreshore; fine-grained sandstone and mudstone
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 39577: authorized by Martin Aberhan, entered by Sabine Nürnberg on 31.05.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
Aphrodina pseudoplana venus clam | |
Thetis japonica Hayami 1975 clam | |
Anthonya japonica clam | |
Apiotrigonia (Heterotrigonia) subovalis Jimbo 1894 clam | |
Crenella gyliakina clam | |
Entolium cf. obovatum scallop | |
Pseudoptera acuticarinata oyster | |
? Trigonarca sp., "Glycymeris (Glycymerita) katsurazawensis" = Glycymerita
? Trigonarca sp. Conrad 1862 clam
"Glycymeris (Glycymerita) katsurazawensis" = Glycymerita clam | |
Cucullaea (Idonearca) ezoensis, "Cucullaea (Idonearca) aff. truncata" = Cucullaea (Cyphoxis) truncata
"Cucullaea (Idonearca) aff. truncata" = Cucullaea (Cyphoxis) truncata Gabb 1864 clam |