Station 168 - Koyagi Fm, Takashima (Eocene of Japan)

Where: Japan (33.0° N, 129.5° E: paleocoordinates 38.4° N, 123.3° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Koyagi Formation, Middle Eocene (47.8 - 37.7 Ma)

• STRATIGRAPHIC RELATIONS: From Koyagi Fm, which unconformably overlies Mesozoic metamorphic rocks and underlies the Futagojima Fm. THICKNESS: From bed in upper 110 m of formation, which attains a total thickness of nearly 1000 m. AGE: Middle Eocene, based on molluscan biostratigraphy. STRATIGRAPHIC POSITION: From bed near top of formation.

• bed-level stratigraphic resolution

Environment/lithology: estuary or bay; lithified siltstone

• ENVIRONMENT: Marginal marine, siliciclastic environment..
• SPECIFIC LITHOLOGY: Siltstone. LITHIFICATION: Presumed lithified on the basis of age.

Size class: macrofossils

Collection methods: surface (float),

• COLLECTOR: A. Mizuno (c. 1964). REPOSITORY: Not stated in text, unknown.

Primary reference: A. Mizuno. 1964. Paleogene and Early Neogene molluscan faunae in West Japan. Geological Survey of Japan Report 204 [A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 70965: authorized by Austin Hendy, entered by Austin Hendy on 12.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for gastropoda and bivalvia. NOMENCLATURE: Farly modern nomenclature, and species-level assignments.
Show authors, comments, and common names
unclassified
  -
Cristaria sp.
Bivalvia
 Unionida - Unionidae
Anodonta sp.
Anodonta sp. freshwater mussel
 Cardiida - Corbiculidae
Corbicula sp.
Corbicula sp. Megerle 1811 clam