Shuparo river area: Middle Turonian - Late Turonian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chondrichthyes - Echinorhiniformes - Echinorhinidae
Echinorhinus sp. Blainville 1816
Cephalopoda - Ammonitida - Nostoceratidae
Eubostrychoceras sp. Matsumoto 1967
Cephalopoda - Ammonitida - Acanthoceratidae
Cephalopoda - Ammonitida - Desmoceratidae
see common names

Geography
Country:Japan
Coordinates: 43.1° North, 142.2° East (view map)
Paleocoordinates:50.5° North, 143.3° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:hand sample
Time
Period: Cretaceous Epoch: Late Cretaceous
Stage: Turonian 10 m.y. bin: Cretaceous 6
Key time interval: Middle Turonian - Late Turonian
Age range of interval: 93.9 - 89.8 m.y. ago
Stratigraphy
Geological group:Yezo Formation:Saku
Stratigraphic resolution:bed
Stratigraphy comments: However, the GMNH-PV-3227 specimen was accompanied by the specimen of ammonite, Romaniceras (Romaniceras) sp. The range of the subgenus of this ammonite is limited to the middle to upper Turonian.
Lithology and environment
Primary lithology:concretionary lithified mudstone
Lithology description: Muddy material containing numerous fragments of plant matter and carbonaceous material, presumed to have originally been a single carbonate nodule.
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Collection method comments: Repository: Gunma Museum of Natural History
Metadata
Database number:277045
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:M. Clapham Research group:marine invertebrate,vertebrate
Created:2026-01-19 20:47:02 Last modified:2026-01-19 20:49:38
Access level:the public Released:0000-00-00 00:00:00
Creative Commons license:
Reference information

Primary reference:
93939. Y. Takakuwa, T. Karasawa, and A. Ishii. 2018. New fossil record of the genus Echinorhinus (Chondrichthyes, Echinorhiniformes) from the Turonian of northwestern Pacific area. Bulletin of Gunma Museum of Natural History 22:67-71 [M. Clapham/M. Clapham]