Ashoro: Chattian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Osteichthyes - Cetacea - Aetiocetidae
1 specimen
AMP 9
Tsai and Ando 2016
see common names

Geography
Country:Japan State/province:Hokkaido
Coordinates: 43.2° North, 143.5° East (view map)
Paleocoordinates:44.8° North, 140.0° East (Wright 2013)
Basis of coordinate:estimated from map
Time
Period: Paleogene Epoch: Oligocene
Stage: Chattian 10 m.y. bin: Cenozoic 4
Key time interval: Chattian
Age range of interval: 27.3 - 23.04 m.y. ago
Age estimate: maximum 27.4 ± 1.5 Ma (K-Ar)
Stratigraphy
Formation:Morawan Member:upper tuffaceous siltstone
Stratigraphy comments: late Oligocene; date from "middle hard shale member" of Morawan formation (Funakawa 1995).
Lithology and environment
Primary lithology:tuffaceous siltstone
Includes fossils?Y
Environment:shoreface
Geology comments: basinal (siliceous), near shore
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Metadata
Database number:162501
Authorizer:M. Uhen Enterer:M. Uhen
Modifier:P. Wagner Research group:vertebrate
Created:2014-09-26 15:02:46 Last modified:2026-03-06 13:19:38
Access level:the public Released:2014-09-26 15:02:46
Creative Commons license:CC0
Reference information

Primary reference:
52922. T. Ando and C. -H. Tsai. 2014. Large aetiocetid implies a wide ranges of inch in early Mysticeti. Society of Vertebrate Paleontology Program and Abstracts 79 [M. Uhen/M. Uhen]

Secondary references:

59774 C.-H. Tsai and T. Ando. 2016. Niche partitioning in Oligocene toothed mysticetes (Mysticeti: Aetiocetidae). Journal of Mammalian Evolution 23:33-41 [M. Uhen/M. Uhen]