Rutaka Bridge: Tortonian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Osteichthyes - Carnivora - Odobenidae
1 specimen
UHR 33282
see common names

Geography
Country:Japan State/province:Hokkaido County:Ishikari-gun
Coordinates: 43.5° North, 141.6° East (view map)
Paleocoordinates:43.1° North, 139.6° 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
Stratigraphic resolution:bed
Stratigraphy comments: Based on these chronological information, Takano et al. [3] estimated the age of the Ichibangawa Formation (except the glauconite bed) to be approximately 11.5–10 Ma, and they also considered the uppermost glauconite bed of the Ichibangawa Formation to be around 10–9.5 Ma based on previous studies.
Lithology and environment
Primary lithology:glauconitic sandstone
Includes fossils?Y
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Metadata
Database number:172573
Authorizer:M. Uhen Enterer:M. Uhen
Modifier:M. Uhen Research group:vertebrate
Created:2015-08-11 16:43:58 Last modified:2025-02-22 15:12:02
Access level:the public Released:2015-08-11 16:43:58
Creative Commons license:CC0
Reference information

Primary reference:
56049. Y. Tanaka and N. Kohno. 2015. A New Late Miocene Odobenid (Mammalia: Carnivora) from Hokkaido, Japan Suggests Rapid Diversification of Basal Miocene Odobenids. PLoS One [M. Uhen/M. Uhen]

Secondary references:

40896 I. Magallanes, J. F. Parham, G.-P. Santos and J. Velez-Juarbe. 2018. A new tuskless walrus from the Miocene of Orange County, California, with comments on the diversity and taxonomy of odobenids. PeerJ 6:e5708 [M. Uhen/M. Shalap/M. Uhen]