San-in Railroad tunnel, Chigono, Y-5, Shimoyakuno: Smithian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Ostreida - Pinnidae
"Pinna" sp. Linnaeus 1758
Bivalvia - Pectinida - Claraiidae
Bivalvia - Protobranchia - Malletiidae
Cephalopoda - Ceratitida - Meekoceratidae
Cephalopoda - Ceratitida - Xenodiscidae
Gastropoda
see common names

Geography
Country:Japan
Coordinates: 35.3° North, 135.0° East (view map)
Paleocoordinates:4.3° North, 132.6° East (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Triassic Epoch: Early Triassic
Stage: Olenekian 10 m.y. bin: Triassic 1
Key time interval: Smithian
Age range of interval: 250.8 - 248.6 m.y. ago
Stratigraphy
Geological group:Yakuno
Stratigraphic resolution:group of beds
Stratigraphy comments: Lower Y1 Formation. Possibly Smithian based on Meekoceratids?
Lithology and environment
Primary lithology:green,blue lithified "shale"
Lithology description: Dark greenish-blue slaty shale
Environment:marine indet.
Taphonomy
Modes of preservation:mold/impression
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:115243
Authorizer:M. Clapham Enterer:M. Clapham
Research group:marine invertebrate
Created:2011-08-31 11:04:57 Last modified:2025-02-22 15:12:02
Access level:the public Released:2011-08-31 11:04:57
Creative Commons license:CC0
Reference information

Primary reference:
33624. K. Nakazawa. 1953. Discovery of Claraia and Eumorphotis from Triassic Yakuno Group, Kyoto Pref, Japan. Memoirs of the College of Science, University of Kyoto, Series B 20:261-269 [M. Clapham/M. Clapham/M. Clapham]