Kabura River, Yoshii: Tortonian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Osteichthyes - Cetacea - Kentriodontidae
see common names

Geography
Country:Japan State/province:Gunma County:Yoshii
Coordinates: 36.3° North, 139.0° East (view map)
Paleocoordinates:35.9° North, 137.2° East (Wright 2013)
Basis of coordinate:stated in text
Time
Period: Neogene Epoch: Miocene
Stage: Tortonian 10 m.y. bin: Cenozoic 6
Key time interval: Tortonian
Age range of interval: 11.63 - 7.246 m.y. ago
Stratigraphy
Geological group:Annaka Formation:Haraichi
Stratigraphy comments: The specimen was found in a horizon located stratigraphically between the Baba and Kamikoi- zawa tuffs. As mentioned above 40Ar/39Ar dating of the Baba tuff yielded geological ages of 11.26±0.09 Ma (biotite) and 11.29 ± 0.12 Ma (sanidine) (Odin et al., 1997). Although the age of the Kamikoizawa tuff, which overlies the horizon from which the paratype specimen was found, is unknown, Takahashi and Hayashi (2004) estimated an earliest late Miocene age based on sedimentation rates.
Lithology and environment
Primary lithology: not reported
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Metadata
Database number:200053
Authorizer:M. Uhen Enterer:M. Uhen
Research group:vertebrate
Created:2019-03-04 09:37:08 Last modified:2025-02-22 15:12:02
Access level:the public Released:2019-03-04 09:37:08
Creative Commons license:CC0
Reference information

Primary reference:
25731. T. Kimura and Y. Hasegawa. 2019. A new species of Kentriodon (Cetacea, Odontoceti, Kentriodontidae) from the Miocene of Japan. Journal of Vertebrate Paleontology 1-93 [M. Uhen/M. Uhen/M. Uhen]