Where: Hokkaido, Japan (43.3° N, 141.9° E: paleocoordinates 46.3° N, 136.8° E)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Poronai Formation, Middle Eocene (48.6 - 37.2 Ma)
• formation-level stratigraphic resolution
Environment/lithology: slope; lithified, massive, concretionary, tuffaceous, sandy, calcareous siltstone
Size classes: macrofossils, mesofossils
Primary reference: A. Suzuki. 2000. An Eocene cold-water molluscan assemblage from thr Poronai Formation in the Mikasa area, central Hokkaido, northern Japan. Earth Science (Chikyu Kagaku) 54:363-368 [J. Sessa/L. Eccles/L. Eccles]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 103769: authorized by Jocelyn Sessa, entered by Laurie Eccles on 02.02.2011
Creative Commons license: CC BY (attribution)
Taxonomic list
Foraminifera | |
Nodosariata | |
Globothalamea | |
Gyroidina sp. d'Orbigny 1826 | |
Anomalina sp. d'Orbigny 1826 | |
Foraminifera | |
Elphidium sp. Monfort 1808 | |
Ammobaculites sp. Cushman 1910 | |
Haplophragmoides spp. Cushman 1910 | |
Gastropoda | |
Orectospira wadana turret shell | |
Neptunea sp. Röding 1798 true whelk | |
Bivalvia | |
Conchocele bisecta Conrad 1849 clam | |
Periploma besshoense clam | |
Acila picturata divaricate nutclam | |
Malletia poronaica clam | |
Portlandia watasei clam
Portlandia sp. Mörch 1857 clam |