Kanasaki, Minano-machi: Early Miocene - Middle Miocene, Japan
collected by Masasuku Iwasawa

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chondrichthyes - Carcharhiniformes - Carcharhinidae
1 specimen
A326-2
see common names

Geography
Country:Japan
Coordinates: 36.1° North, 139.1° East (view map)
Paleocoordinates:36.0° North, 136.4° 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 - Middle Miocene
Age range of interval: 23.04 - 11.63 m.y. ago
Stratigraphy
Geological group:Akabira
Stratigraphic resolution:group of beds
Stratigraphy comments: Likely from the lower part of the Akabira Group
Lithology and environment
Primary lithology: sandstone
Lithology description: black sandstone; being considerably more friable than the sections utilized for building stone
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Collectors:Masasuku Iwasawa
Collection method comments: Repository: Iwajuku Museum, Midori City
Metadata
Database number:278428
Authorizer:M. Clapham Enterer:M. Clapham
Research group:vertebrate
Created:2026-03-21 19:00:09 Last modified:2026-03-21 19:00:09
Access level:the public Released:0000-00-00 00:00:00
Creative Commons license:
Reference information

Primary reference:
94374. Y. Takakuwa and M. Shimizu. 2015. On the shark tooth remains, collected by natural historian Shosaku Iwasawa - focuses of Tenjinyama specimen. Bulletin of the Gunma Museum of Natural History 19:55-61 [M. Clapham/M. Clapham/M. Clapham]