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 70608: authorized by Austin Hendy, entered by Austin Hendy on 29.03.2007
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
Cyclocardia laxata clam | |
Nucula omagariensis nut clam
"Acila brevis" = Acila (Acila) brevis Nagao and Huzioka 1941 divaricate nutclam
Acila cf. praedivaricata Nagao and Huzioka 1941 divaricate nutclam | |
Portlandia watasei clam |