Locality 1 - 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 unknown position within 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: 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 71014: authorized by Austin Hendy, entered by Austin Hendy on 14.04.2007, edited by Mihaela Krause

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for gastropoda and bivalvia. NOMENCLATURE: Farly modern nomenclature, and species-level assignments.
Bivalvia
 Nuculanida - Sareptidae
Portlandia sp. Mörch 1857 clam
 Mytilida - Mytilidae
Septifer ? sp. Récluz 1848 mussel
 Solenida - Solenidae
Solena sp. Mörch 1853 clam
 Cardiida - Tellinidae
Tellina (Tellinella) tricarinata Nagao 1928 tellin clam
 Cardiida - Veneridae
Pitar hinokumai venus clam
 Pholadida - Corbulidae
 Lucinida - Lucinidae
Lucinidae indet. Fleming 1828 clam
Gastropoda
 Sorbeoconcha - Thersiteidae
"Orthaulax" japonicus Nagao 1924 snail
 Neogastropoda - Melongenidae
Sycostoma ? sp. Cox 1931 snail
 Sorbeoconcha - Naticidae
"? Polinices eocenica" = Neverita eocenica, "Neverita eocenica" = Neverita eocenica
"? Polinices eocenica" = Neverita eocenica Nagao 1928 moon snail
"Neverita eocenica" = Neverita eocenica Nagao 1928 moon snail
 Cerithioidea - Turritellidae
Mesalia goshourensis Matsubara and Ugai 2006 turret shell
Colpospira okadai turret shell
Colpospira tashiroi turret shell
Colpospira (Acutospira) tashiroi Kotaka 1959 turret shell
 Cerithioidea - Potamididae
Vicarya sp. d'Archiac and Haime 1854 horn snail
 Seguenzioidea - Eucyclidae
Lischkeia sp. Fischer 1879 snail