Sankebetsu Fm (lower part): Early Miocene, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Protobranchia - Yoldiidae
Bivalvia - Pholadida - Myidae
Mya (Mya) truncata (Linnaeus 1758)
Platyodon nipponica Uozumi and Fujie 1956
Bivalvia - Pholadida - Pholadidae
Bivalvia - Venerida - Mactridae
Bivalvia - Cardiida - Tellinidae
Bivalvia - Mytilida - Mytilidae
see common names

Geography
Country:Japan
Coordinates: 44.4° North, 141.7° East (view map)
Paleocoordinates:44.6° North, 137.8° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Neogene Epoch: Miocene
10 m.y. bin: Cenozoic 5
Key time interval: Early Miocene
Age range of interval: 23.04 - 15.98 m.y. ago
Stratigraphy
Formation:Sankebetsu
Stratigraphic resolution:bed
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Sankebetsu Fm (Sankebetsu Sandstone), which unconformably overlies the Sakasagawa Fm (Late Eocene) and is unconformably overlain by the Chikubetsu Fm (Middle Miocene). THICKNESS: Unknown thickness of unit. AGE: Early Miocene on the basis of molluscan biostratigraphy. STRATIGRAPHIC POSITION: Lower part of formation.
Lithology and environment
Primary lithology: lithified sandstone
Lithology description: SPECIFIC LITHOLOGY: Sandstone/ LITHIFICATION: Presumably lithified, on the basis of age.
Environment:coastal indet.
Geology comments: ENVIRONMENT: coastal siliciclastic environment.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:survey of museum collection
Reason for describing collection:biostratigraphic analysis
Collection method comments: COLLECTOR: Based on previous collectors (see Noda 1992, 1995). REPOSITORY: Unknown repository.
Taxonomic list comments:COVERAGE: Only includes characteristic bivalvia; other taxa not listed, possibly reported in Noda (1992, 1995). NOMENCLATURE: Not an authoritative publication, but with very current nomenclature and subgenus/species resolution identifications.
Metadata
Database number:70422
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2007-03-22 10:21:50 Last modified:2025-02-22 15:12:02
Access level:authorizer only Released:2008-03-22 10:21:50
Creative Commons license:CC0
Reference information

Primary reference:
23622. A. I. Kafanov, K. Ogasawara, and Y. Noda. 2005. Cenozoic molluscan (Bivavia) cenozone of Hokkaido, Northern Japan. Science Report, Institute of Geosciences, Univeristry of Tsukuba 26:1-12 [A. Hendy/A. Hendy/A. Hendy]