Morawan (Lower Hard Shale Member): Chattian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Osteichthyes - Perissodactyla - Desmostylidae
1 specimen
see common names

Geography
Country:Japan State/province:Hokkaido
Coordinates: 43.3° North, 143.8° East (view map)
Paleocoordinates:44.9° North, 140.2° 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: 29.2 ± 3.3 Ma (fission track) to 27.4 ± 1.5 Ma (U/Pb)
Stratigraphy
Geological group:Kawakami Formation:Morawan Member:Lower Hard Shale
Stratigraphy comments: early late Oligocene. Dates from Funakawa 1995 (Transactions and Proceedings of the Palaeontological Society of Japan NS 108:208-215)
Lithology and environment
Primary lithology: lithified "shale"
Includes fossils?Y
Environment:marine indet.
Taphonomy
Modes of preservation:body,original phosphate
Size of fossils:macrofossils
Collection methods and comments
Collection methods:surface (float),field collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:58896
Authorizer:M. Uhen Enterer:M. Uhen
Modifier:P. Wagner Research group:vertebrate
Created:2006-02-28 11:39:06 Last modified:2026-03-05 21:10:42
Access level:the public Released:2006-02-28 11:39:06
Creative Commons license:CC0
Reference information

Primary reference:
16701. N. Inuzuka. 2000. Primitive late Oligocene desmostylians from Japan and Phylogeny of the Desmostylia. Bulletin of the Ashoro Museum of Paleontology 1:91-123 [M. Uhen/M. Uhen]

Secondary references:

94284 A. Kolesnikov, I. Latysheva, M. Ovtcharova, F. Bowyer, V. Pankova, V. Pankov, N. Kuznetsov, A. Shatsillo, A. Nagovitsin and T. Romanyuk. 2026. High-precision U-Pb data constrain the age of Ediacara biota in the Central Urals, Russia. Gondwana Research 155(78):137-143 [P. Wagner/P. Wagner]