Locality 5 - Shiratake 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

• outcrop-level geographic resolution

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

• STRATIGRAPHIC RELATIONS: From Shiratake Fm, which conformably overlies the ?Early-Middle Eocene Akasaki Fm (and in places unconformably overlies Cretaceous sediments), and is conformably overlain by the Kyoragi Fm (Middle Eocene). THICKNESS: From bed within formation of group that attains a thickness of 100 m. AGE: Middle Eocene, based on molluscan biostratigraphy. STRATIGRAPHIC POSITION: From upper part of formation.

• bed-level stratigraphic resolution

Environment/lithology: marginal marine; lithified, silty sandstone

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

Size class: macrofossils

Collection methods: surface (float),

• COLLECTOR: Y. Takai (uknown date). 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 71022: 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 - Crassatellidae
"Crassatellites nipponensis" = Crassatella
"Crassatellites nipponensis" = Crassatella clam
 Carditida - Carditidae
"Venericardia mandaica" = Venericardia (Venericardia) mandaica, "Venericardia nipponica" = Venericardia (Venericor) nipponica
"Venericardia mandaica" = Venericardia (Venericardia) mandaica Yokoyama 1911 clam
"Venericardia nipponica" = Venericardia (Venericor) nipponica Yokoyama 1911 clam
 Protobranchia - Yoldiidae
Yoldia sp. Möller 1842 clam
Gastropoda
 Cerithiacea - Turritellidae
Colpospira tashiroi turret shell
 Neogastropoda - Volutidae
? Volutospina nishimurai Nagao 1928 volute
 Neogastropoda - Tudiclidae
 Neogastropoda - Buccinidae
? Pseudoneptunea sp. Kobelt 1882 true whelk
 Stromboidea - Thersiteidae
"Orthaulax" japonicus Nagao 1924 snail
 Naticoidea - Naticidae
"Polinices eocenica" = Neverita eocenica
"Polinices eocenica" = Neverita eocenica Nagao 1928 moon snail