Locality 6 - Toishi Fm, Amakusa (Eocene of Japan)

Where: Japan (32.4° N, 130.2° E: paleocoordinates 39.7° N, 124.1° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Toishi Formation, Middle Eocene (48.6 - 37.2 Ma)

• STRATIGRAPHIC RELATIONS: From Toishi Fm, which conformably overlies the Kyoragi Fm (Middle Eocene), and is conformably overlain by the Itchada Fm (Late Eocene). THICKNESS: From bed within formation of group that attains a thickness of ~500 m. AGE: Middle Eocene, based on molluscan biostratigraphy. STRATIGRAPHIC POSITION: From lowermost part of formation.

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified, silty sandstone

• ENVIRONMENT: Shallow marine, siliciclastic environment.
• SPECIFIC LITHOLOGY: Silty sandstone. 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 71018: authorized by Austin Hendy, entered by Austin Hendy on 14.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for gastropoda and bivalvia. NOMENCLATURE: Farly modern nomenclature, and species-level assignments.
Bivalvia
 Carditida - Carditidae
"Venericardia nipponica" = Venericardia (Venericor) nipponica
"Venericardia nipponica" = Venericardia (Venericor) nipponica Yokoyama 1911 clam
 Cardiida - Corbiculidae