Locality 5 - Shiratake Fm, Amakusa: Middle Eocene, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Carditida - Carditidae
Bivalvia - Carditida - Crassatellidae
Bivalvia - Protobranchia - Yoldiidae
Yoldia sp. Möller 1842
Gastropoda - Naticidae
Gastropoda - Thersiteidae
Gastropoda - Neogastropoda - Buccinidae
Gastropoda - Neogastropoda - Muricidae
Gastropoda - Neogastropoda - Volutidae
Gastropoda - Turritellidae
see common names

Geography
Country:Japan
Coordinates: 32.4° North, 130.2° East (view map)
Paleocoordinates:38.3° North, 126.4° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Paleogene Epoch: Eocene
10 m.y. bin: Cenozoic 2-3
Key time interval: Middle Eocene
Age range of interval: 48.07 - 37.71 m.y. ago
Stratigraphy
Formation:Shiratake
Stratigraphic resolution:bed
Stratigraphy comments: 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.
Lithology and environment
Primary lithology: lithified silty sandstone
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Silty sandstone. LITHIFICATION: Presumed lithified on the basis of age.
Environment:marginal marine indet.
Geology comments: ENVIRONMENT: Marginal marine, siliciclastic environment.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:surface (float),field collection
Reason for describing collection:biostratigraphic analysis
Collection method comments: COLLECTOR: Y. Takai (uknown date). REPOSITORY: Not stated in text, unknown.
Taxonomic list comments:COVERAGE: Exhaustive for gastropoda and bivalvia. NOMENCLATURE: Farly modern nomenclature, and species-level assignments.
Metadata
Database number:71022
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2007-04-14 20:15:36 Last modified:2025-02-22 15:12:02
Access level:authorizer only Released:2008-04-14 20:15:36
Creative Commons license:CC0
Reference information

Primary reference:
23772. A. Mizuno. 1964. Paleogene and Early Neogene molluscan faunae in West Japan. Geological Survey of Japan Report 204 [A. Hendy/A. Hendy]