Akan-cho: Langhian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chondrichthyes - Lamniformes - Lamnidae
Isurus hastalis (Agassiz 1838)
recombined as Carcharodon hastalis
Chondrichthyes - Lamniformes - Otodontidae
Carcharodon megalodon (Agassiz 1835)
recombined as Otodus megalodon
Mammalia - Perissodactyla - Paleoparadoxiidae
Paleoparadoxia sp. Reinhart 1959
Mammalia - Perissodactyla - Desmostylidae
Desmostylus sp. Marsh 1888
Mammalia - Cetacea
Cetacea indet. Brisson 1762
Mammalia - Carnivora
Pinnipedia indet. (Illiger 1811)
Kohno 2002 1 specimen
Mammalia - Carnivora - Odobenidae
Odobenidae indet. (Allen 1880)
Kohno 2002 1 specimen
Mammalia - Carnivora - Desmatophocidae
Allodesminae indet. (Kellogg 1931)
Kohno 2002 9 specimens
see common names

Geography
Country:Japan State/province:Hokkaido
Coordinates: 43.2° North, 144.0° East (view map)
Paleocoordinates:43.8° North, 142.3° East
Basis of coordinate:estimated from map
Time
Period:Neogene Epoch:Miocene
Stage:Langhian 10 m.y. bin:Cenozoic 5
Key time interval:Langhian
Age range of interval:15.97000 - 13.82000 m.y. ago
Stratigraphy
Formation:Tonokita
Stratigraphic resolution:formation
Stratigraphy comments: 15.9 - 14.9 Ma. Age after Matsui and Kawabe (2015)
Lithology and environment
Primary lithology: mudstone
Includes fossils?Y
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Taxonomic list comments:Atsunai-Togeshita fauna
Metadata
Database number:55652
Authorizer:M. Uhen Enterer:M. Uhen
Modifier:M. Uhen Research group:vertebrate
Created:2005-11-02 06:21:52 Last modified:2021-06-01 14:37:43
Access level:the public Released:2005-11-02 06:21:52
Creative Commons license:CC BY
Reference information

Primary reference:

15028. M. Kimura, M. Yahata, H. Sawamura, I. Segawa, A. Suzuki and Y. Muraishi. 1998. The vertebrate fossils and their horizon from Akan-cho, eastern Hokkaido, Japan. Earth Science (Chikyu Kagaku) 52:44-50 [M. Uhen/M. Uhen]

Secondary references:

77034 N. Kohno. 2002. Pinniped fossils from Akan-cho, Hokkaido. Research report of Akan fossil fauna 17(28) [M. Uhen/M. Uhen]
76950 W. Tonomori, S. Kawano, K. Otsua and H. Hayashi. 2021. Report of an allodesmine humerus from Shimane, Japan: summary of Japanese allodesmines. Historical Biology [M. Uhen/M. Uhen]