Where: Japan (43.0° N, 144.4° E: paleocoordinates 44.8° N, 141.7° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Rushin Formation (Urahoro Group), Early/Lower Oligocene (33.9 - 28.4 Ma)

• STRATIGRAPHIC RELATIONS: Basal formation of the Urahoro Group, which unconformably overlies the Late Cretaceous-Paleocene Kawarupu Formation of the Nemuro Group and is overlain by the Yubetsu Formation of the Urahoro Group (presumably also Early Oligocene). THICKNESS: Unknown thickness of unit. AGE: Presumably Early Oligocene; from basal unit of Oligocene age in region. STRATIGRAPHIC POSITION: Collection representative of entire formation in local area.

• formation-level stratigraphic resolution

Environment/lithology: marginal marine; lithified, fine-grained, pebbly, gray, conglomeratic, carbonaceous sandstone

Size class: macrofossils

Collection methods: COLLECTOR: Unknown collected, possibly Y. Honda. REPOSITORY: Unknown repository.

Primary reference: Y. Honda. 1986. A Paleogene molluscan fauna from Hokkaido, northern Japan. Paleontological Society of Japan Special Papers 29:3-15 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 68892: authorized by Austin Hendy, entered by Austin Hendy on 12.02.2007

Creative Commons license: CC BY (attribution)