900 m south of Osedani: Langhian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chondrichthyes - Squaliformes - Squalidae
Chondrichthyes - Squaliformes - Centrophoridae
Deania sp. Jordan and Snyder 1902
Centrophorus sp. Müller and Henle 1837
Chondrichthyes - Squaliformes - Somniosidae
Chondrichthyes - Squaliformes - Etmopteridae
Etmopterus sp. Rafinesque 1810
see common names

Geography
Country:Japan
Coordinates: 36.6° North, 137.1° East (view map)
Paleocoordinates:36.4° North, 134.6° East (Wright 2013)
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period: Neogene Epoch: Miocene
Stage: Langhian 10 m.y. bin: Cenozoic 5
Key time interval: Langhian
Age range of interval: 15.98 - 13.82 m.y. ago
Stratigraphy
Geological group:Yatsuo Formation:Higashibessho Member:Tochiage Mudstone
Stratigraphic resolution:group of beds
Stratigraphy comments: Upper part of the Tochiage Mudstone Member of the Higashibessho Formation of the Yatsuo Group. According to Yanagisawa (1999) and Watanabe and Yanagisawa (2005), the depositional duration of the upper part of the Tochiage Mudstone Member is assigned to the interval between 15.8 and 15.6 Ma on the basis of diatom assemblages.
Lithology and environment
Primary lithology:massive,concretionary,gray lithified mudstone
Lithology description: gray massive mudstone with small (around several centimeters in diameter) calcareous concretions
Environment:basinal (siliciclastic)
Geology comments: Hasegawa and Takahashi (1992) indicated that the Higashibessho Formation was deposited under the middle bathyal environments based on its benthic foraminifera assemblage
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collection method comments: Repository: Ujihara Laboratory Specimens Room of the Graduate School of Environmental Studies, Nagoya University
Metadata
Database number:277610
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:M. Clapham Research group:vertebrate
Created:2026-02-03 12:27:16 Last modified:2026-02-03 12:33:54
Access level:the public Released:0000-00-00 00:00:00
Creative Commons license:
Reference information

Primary reference:
94100. K. Nishimatsu and A. Ujihara. 2019. A new deep-sea shark Scymnodalatias Kazenobon (Squaliformes, Somniosidae) from the Miocene Yatsuo Group in central Japan. Paleontological Research 23:23-28 [M. Clapham/M. Clapham]