SK1-1 - Shitakara Fm (lower), Akan district (Oligocene of Japan)

Where: Japan (43.3° N, 144.1° E: paleocoordinates 45.0° N, 141.3° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Shitakara Formation, Early/Lower Oligocene (33.9 - 28.4 Ma)

• STRATIGRAPHIC RELATIONS: From Shitakara Fm of the Urahoro Gp, which overlies the Yubetsu Fm and is overlain by the Shakubetsu Fm, both of the Urahoro Gp (Early Oligocene). THICKNESS: From bed within unit 100-200 m thick. AGE: Early Oligocene based on molluscan biostratigraphy. STRATIGRAPHIC POSITION: From bed within lower part of the formation.

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified sandstone and lithified conglomerate

• ENVIRONMENT: Coastal marine, siliciclastic environment.
• SPECIFIC LITHOLOGY: Sandstone, conglomerate, and siltstone. LITHIFICATION: Assumed to be lithifed on the basis of figured specimens and age.

Size class: macrofossils

Collection methods: COLLECTOR: Presumably Y. Honda (c. 1989). 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 70729: authorized by Austin Hendy, entered by Austin Hendy on 03.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for gastropoda, bivalvia and scaphopoda. NOMENCLATURE: Authoritative publication, using moderately recent nomenclature, subgenus and species level designations.
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Bivalvia
 Ostreida - Ostreidae
Ostrea eorivularis
Ostrea eorivularis Oyama and Mizuno 1958 oyster