Location 13 - Shimokine Fm, Rumoi (Eocene of Japan)

Where: Japan (44.0° N, 141.9° E: paleocoordinates 46.3° N, 138.1° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Shimokine Formation (Tappu Group), Late/Upper Eocene (37.2 - 33.9 Ma)

• STRATIGRAPHIC RELATIONS: From Shimokine Fm of the Tappu Gp, a correlative of the Poronai and Shimizusawa Fm. THICKNESS: From bed with formation which reaches a thickness of 500 m. AGE: Late Eocene on the basis of molluscan biostratigraphy. STRATIGRAPHIC POSITION: Unknown position within formation.

• formation-level stratigraphic resolution

Environment/lithology: coastal; lithified, fine-grained, medium sandstone

• ENVIRONMENT: Shallow marine, siliciclastic environment.
• SPECIFIC LITHOLOGY: Medium-fine grained sandstone. LITHIFICATION: Assume to be lithified on the basis of age.

Size class: macrofossils

Collection methods: COLLECTOR: K. Kubo. REPOSITORY: Unknown, not stated in text.

Primary reference: A. Mizuno. 1964. Summary of the Paleogene molluscan faunas in North Japan. Geological Survey of Japan Report 207 [A. Hendy/A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 71035: authorized by Austin Hendy, entered by Austin Hendy on 14.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for bivalvia and gastropoda. NOMENCLATURE: Somewhat antiquated, but with species-level identifications.
Bivalvia
 Carditida - Carditidae
"Venericardia yokoyamai" = Venericardia (Cyclocardia) yokoyamai
"Venericardia yokoyamai" = Venericardia (Cyclocardia) yokoyamai Oyama and Mizuno 1958 clam
 Pholadida - Myidae
"Mya grewingki" = Mya (Arenomya) grewingki
"Mya grewingki" = Mya (Arenomya) grewingki Makiyama 1934 softshell clam
 Thraciida - Thraciidae
Thracia sp. Blainville 1824 clam
Gastropoda
 Sorbeoconcha - Turritellidae