Kangawa River SFMCV-0360: Langhian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chondrichthyes - Squaliformes - Somniosidae
Centroselachus sp. Garman 1913
Suzuki 2008
Chondrichthyes - Squaliformes - Dalatiidae
see common names

Geography
Country:Japan
Coordinates: 36.4° North, 138.3° East (view map)
Paleocoordinates:36.2° North, 135.8° 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
Formation:Iseyama
Stratigraphic resolution:bed
Stratigraphy comments: Lower part of the Iseyama Formation (all of the sharks described in Suzuki's papers come from different stratiigraphic horizons, but the localities/levels are not labeled so the collection name is based on the specimen number). The Yokoo and Motohara area strata, which were divided into Yokoo and Iseyama Formations, were correlated with the Uchimura and Bessho Formations (Yamagishi, 1964 ; Kosaka et al., 1992). The upper part of the Uchimura Formation and the lower part of the Bessho Formation biostatigraphically correspond to Zone N8 to N9 of the Tertiary planktonic foraminiferal fossil zone of the Middle Miocene in age (Blow, 1969; Kosaka et al., 1992). The planktonic foraminiferal fossil, Globigerinoides sicanus and Praeorbulina circularis, occurred in the upper part of the Yokoo Formation, which correspond to Zone N8 to N9 (Kubota and Kosaka, 1990). This means that the geological age of the boundaries of the Yokoo and Iseyama Formations were deposited in the Middle Miocene at the period around 15Ma.
Lithology and environment
Primary lithology: lithified mudstone
Lithology description: Parallel laminated mudstone with a well-sorted thin sandstone layer
Environment:submarine fan
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collection method comments: Repository: Shinshushinmachi Fossil Museum Collection Vertebrate (SFMCV); Graduate School of Natural Science and Technology, Kanazawa University (GNSTKU)
Metadata
Database number:277598
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:M. Clapham Research group:vertebrate
Created:2026-01-31 20:41:02 Last modified:2026-03-19 21:50:29
Access level:the public Released:0000-00-00 00:00:00
Creative Commons license:
Reference information

Primary reference:
94082. H. Suzuki. 2015. A new genus of the Family Dalatiidae (Chondrichthyes: Elasmobranchii) from the Miocene of Japan. Journal of Fossil Research 47:41-47 [M. Clapham/M. Clapham]

Secondary references:

94083 H. Suzuki. 2008. Squaliform shark teeth of the genus Centroselachus from the Miocene of Japan. The Journal of the Geological Society of Japan 114:536-539 [M. Clapham/M. Clapham]