Sakasegawa Fm - Amakusa: Late Eocene, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Turritellidae
Orectospira sp. Dall 1925
Bivalvia - Pholadomyida - Pholadomyidae
Bivalvia - Carditida - Crassatellidae
Bivalvia - Carditida - Carditidae
Bivalvia - Limida - Limidae
Bivalvia - Pectinida - Propeamussiidae
see common names

Geography
Country:Japan
Coordinates: 32.4° North, 130.2° East (view map)
Paleocoordinates:36.3° North, 126.7° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
Time
Period: Paleogene Epoch: Eocene
Stage: Priabonian 10 m.y. bin: Cenozoic 3
Key time interval: Late Eocene
Age range of interval: 37.71 - 33.9 m.y. ago
Stratigraphy
Geological group:Sakasegawa Formation:Sakasegawa
Stratigraphic resolution:formation
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Sakasegawa Fm, which locally overlies the Late Eocene Itchoda Fm, both of the Sakasegawa Gp. THICKNESS: From formation that attains a thickness of ~1000 m. AGE: Late Eocene, based on molluscan biostratigraphy. STRATIGRAPHIC POSITION: Composite list for the formation in this local area.
Lithology and environment
Primary lithology: lithified siltstone
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Siltstone. LITHIFICATION: Presumed lithified on the basis of age.
Environment:coastal indet.
Geology comments: ENVIRONMENT: Shallow sea, soft-bottom siliciclastic bottom.
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: A. Mizuno (c. 1964). 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:70925
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2007-04-11 21:14:48 Last modified:2025-02-22 15:12:02
Access level:authorizer only Released:2008-04-11 21:14:48
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]