Locality 1b, Nameshi-zawa Valley, south of Asadanuki: Spathian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Ceratitida - Danubitidae
Cephalopoda - Ceratitida - Procarnitidae
Procarnites sp. Arthaber 1911
see common names

Geography
Country:Japan
Coordinates: 38.7° North, 141.3° East (view map)
Paleocoordinates:4.8° North, 138.6° 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: Spathian
Age range of interval: 248.6 - 247 m.y. ago
Stratigraphy
Formation:Osawa
Stratigraphic resolution:group of beds
Stratigraphy comments: Ammonoid-bearing beds in loc. 1b are about 1 m thick and situated about 2 m above the top of Loc. 1a. Ammonoid horizons of Loc. 1a to 1c are stratigraphically situated 20 to 30 meters below the boundary between the Osawa and Fukkoshi formations.
Lithology and environment
Primary lithology: lithified mudstone
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collection method comments: Repository: Tohoku University Museum (IGPS)
Metadata
Database number:224866
Authorizer:M. Clapham Enterer:M. Clapham
Research group:marine invertebrate
Created:2022-04-08 00:21:37 Last modified:2025-02-22 15:12:02
Access level:the public Released:2022-04-08 00:21:37
Creative Commons license:CC0
Reference information

Primary reference:
81251. M. Ehiro. 2022. Latest Olenekian (Early Triassic) ammonoids from the uppermost part of the Osawa Formation (Inai Group) in the South Kitakami Belt, northeast Japan. Paleontological Research 26:137-157 [M. Clapham/M. Clapham]