Where: Japan (42.8° N, 143.7° E: paleocoordinates 44.1° N, 141.3° E)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Omagari Formation, Late/Upper Oligocene (28.4 - 23.0 Ma)
• STRATIGRAPHIC RELATIONS: From Omagari Fm of the Ombetsu Gp, which overlies the Shakubetsu Fm of the Urahaoro Gp (Early Oligocene) and is overlain by the Charo Fm of the Ombetsu Gp (Late Oligocene). THICKNESS: From bed with unit 60-160 m thick. AGE: Late Oligocene based on molluscan biostratigraphy. STRATIGRAPHIC POSITION: Unknown position within formation.
• bed-level stratigraphic resolution
Environment/lithology: coastal; lithified, conglomeratic sandstone
Size class: macrofossils
Collection methods: COLLECTOR: Presumably S. Yui (c. 1975). REPOSITORY: Probably Tohoku University, Japan.
Primary reference: Y. Honda. 1989. Paleogene molluscan faunas from the Kushiro Coal Field, Eastern Hokkaido. Tohoku University, Science Report, 2nd series 60(1):1-137 [A. Hendy/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 70612: authorized by Austin Hendy, entered by Austin Hendy on 29.03.2007
Creative Commons license: CC BY (attribution)
Taxonomic list
Scaphopoda | |
Dentalium sp. Linnaeus 1758 tusk shell | |
Bivalvia | |
Conchocele bisecta Conrad 1849 clam | |
Periploma besshoense clam | |
Clinocardium omagariense cockle | |
Portlandia watasei clam | |
Gastropoda | |
"Neptunea ezoana" = Trominina ezoana, Neptunea modestoides
"Neptunea ezoana" = Trominina ezoana Takeda 1953 true whelk
Neptunea modestoides true whelk | |
Neverita asagaiensis Makiyama 1934 moon snail | |
Turritella poronaiensis turret shell |