Fourth Pit of the Ikeno Coal Mine: Early Oligocene, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Osteichthyes - Anthracotheriidae
Brachyodus japonicus n. sp. Matsumoto 1925
NMJH-A-636-1-1- 37 - type
see common names

Geography
Country:Japan
Coordinates: 33.2° North, 129.8° East (view map)
Paleocoordinates:35.5° North, 126.7° East (Wright 2013)
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period: Paleogene Epoch: Oligocene
Stage: Rupelian 10 m.y. bin: Cenozoic 4
Key time interval: Early Oligocene
Age range of interval: 33.9 - 27.3 m.y. ago
Stratigraphy
Geological group:Sasebo Formation:Nakazato
Stratigraphic resolution:bed
Stratigraphy comments: Middle part of the Oligocene (near the boundary between the early and the late Oligocene) - the age of the Nakazato Formation is estimated to be around 29 Ma based on fission-track dating of the formations above and below; “Yunoki Sanmai beds” in the Nakazato Formation (“Hiu Beds” in Nagao, 1927a, b), basal part of the Sasebo Group
Lithology and environment
Primary lithology: mudstone
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Metadata
Also known as:Ohno Town
Database number:180396
Authorizer:P. Mannion Enterer:P. Mannion
Research group:vertebrate
Created:2016-07-15 09:04:43 Last modified:2025-02-22 15:12:02
Access level:the public Released:2016-07-15 09:04:43
Creative Commons license:CC0
Reference information

Primary reference:
59871. T. Tsubamoto and N. Kohno. 2011. Reappraisal of “Brachyodus” japonicus, an Oligocene anthracotheriid cetartiodactyl from Japan. Paleontological Research 15(3):115-124 [P. Mannion/P. Mannion]