Sakamizu: Oligocene, Japan
collected by Koichi Mukaibo

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chondrichthyes - Lamniformes - Otodontidae
1 specimen
KMNH VP 100,115
see common names

Geography
Country:Japan
Coordinates: 33.9° North, 130.7° East (view map)
Paleocoordinates:35.6° North, 127.7° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Paleogene Epoch: Oligocene
10 m.y. bin: Cenozoic 4
Key time interval: Oligocene
Age range of interval: 33.9 - 23.04 m.y. ago
Stratigraphy
Stratigraphic resolution:group of beds
Stratigraphy comments: Said to be from the Sakamizu Formation, but this unit has been subdivided in later papers into the Norimatsu, Jinno-baru, and Honjo Formations. According to the stratigraphic column in Ando & Karasawa (2010), the Norimatsu and Jinno-baru Formations belong to the latest Rupelian lower calcareous nannofossil Subzone CP19a of Okada and Bukry (1980) and the Honjo Formation is in upper zone CP19a, spanning the Rupelian-Chattian boundary.
Lithology and environment
Primary lithology: "siliciclastic"
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:Koichi Mukaibo
Collection method comments: Repository: Kitakyushu Museum of Natural History
Metadata
Database number:278483
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:M. Clapham Research group:vertebrate
Created:2026-03-24 20:43:23 Last modified:2026-03-24 20:43:49
Access level:the public Released:0000-00-00 00:00:00
Creative Commons license:
Reference information

Primary reference:
94412. Y. Yabumoto. 1987. Oligocene lamnid shark of the genus Carcharodon from Kitakyushi, Japan. Bulletin of the Kitakyushu Museum of Natural History 6:239-264 [M. Clapham/M. Clapham]