Shiranuka Fm - SNY-2: Early Pliocene, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Protobranchia - Yoldiidae
Yoldia sp. Möller 1842
Bivalvia - Pholadida - Myidae
Bivalvia - Cardiida - Tellinidae
Bivalvia - Cardiida - Cardiidae
Gastropoda - Neogastropoda - Buccinidae
Buccinidae indet. Rafinesque 1815
see common names

Geography
Country:Japan
Coordinates: 43.0° North, 134.1° East (view map)
Paleocoordinates:43.1° North, 133.4° East (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Neogene Epoch: Pliocene
Stage: Zanclean 10 m.y. bin: Cenozoic 6
Key time interval: Early Pliocene
Age range of interval: 5.333 - 3.6 m.y. ago
Stratigraphy
Formation:Shiranuka
Stratigraphic resolution:bed
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Shiranuka Fm, which overlies the Atsunai Fm (Middle Miocene) of the Atsunai Gp, and is overlain by Pleistocene terraces. THICKNESS: From bed with formation that attains a thickness of 350 m. AGE: latest Late Miocene-Pliocene on the basis of molluscan biostratigraphy; Takikawa-Hombetsu stage (6.0-2 Ma); some debate over age - some author refer fauna strictly to the Pliocene. STRATIGRAPHIC POSITION: From unknown position within the Shiranuka Fm.
Lithology and environment
Primary lithology:gray lithified sandstone
Secondary lithology:gray lithified siltstone
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Gray sandstone and siltstone. LITHIFICATION: Lithified, on the basis of facies description.
Environment:transition zone/lower shoreface
Geology comments: ENVIRONMENT: Assemblage appears to be derived from an shallow shelf siliciclastic environment. TEMPERATURE: Mollusca suggest cool-water conditions.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Collection method comments: COLLECTOR: Y. Honda. REPOSITORY: Institute of Geology and Paleontology, Tohoku University, Sendai, Japan (IGPS).
Taxonomic list comments:COVERAGE: Exhaustive for gastropoda and bivalvia. NOMENCLATURE: Authoritative publication with subgeneric and species-level assignments.
Metadata
Database number:70408
Authorizer:A. Hendy Enterer:A. Hendy
Research group:marine invertebrate
Created:2007-03-21 22:18:18 Last modified:2025-02-22 15:12:02
Access level:authorizer only Released:2007-03-21 22:18:17
Creative Commons license:CC0
Reference information

Primary reference:
23610. Y. Honda. 1988. Molluscan fossils from the Atsunai Group, Kushiro Coal Field, Eastern Hokkaido, Northern Japan. Sato Ho-on Kai Special Publication (Profesoor T. Kotaka Commemorartive Volume) 351-363 [A. Hendy/A. Hendy]