Locality 2 - 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: Nagao (c. 1928). 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 71015: 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.
unclassified
  -
Bivalvia
 Carditida - Carditidae
Venericardia sp. Lamarck 1801 clam
 Pholadida - Corbulidae
? Lentidium kyushuense, "Caryocorbula subtumida" = Caestocorbula subtumida
"Caryocorbula subtumida" = Caestocorbula subtumida Nagao 1928 clam
 Cardiida - Veneridae
Callista ariakensis Nagao 1928 venus clam
Gastropoda
 Triphoroidea - Cerithiopsidae
Cerithiopsis sp. Hanley 1849 snail
 Neogastropoda - Melongenidae
? Sycostoma sp. Cox 1931 snail
 Neogastropoda - Turridae
 Stromboidea - Thersiteidae
"Orthaulax" japonicus Nagao 1924 snail
 Naticoidea - Naticidae
? Lunatia utoensis Nagao 1928 moon snail
 Sorbeoconcha - Turritellidae
Colpospira okadai turret shell
Orectospira gemma turret shell
 Sorbeoconcha - Pachychilidae
Faunus nipponicus Nagao 1928 snail
 Neritoidea - Neritidae