Kangawa River 2 (HS-Ise collection): Langhian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chondrichthyes - Squaliformes - Squalidae
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:group of beds
Stratigraphy comments: Lower part of the Iseyama Formation, from a laminated mudstone unit above the sandstone with alternating mudstone that yielded the Dalatias licha specimens. 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
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: Hideshi Suzuki collection
Metadata
Database number:277600
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:M. Clapham Research group:vertebrate
Created:2026-01-31 21:04:24 Last modified:2026-03-19 22:35:19
Access level:the public Released:0000-00-00 00:00:00
Creative Commons license:
Reference information

Primary reference:
94085. H. Suzuki. 2007. Discovery of fossil teeth of dogfish, the genus Squalus from the Northern Fossa Magna Region, Nagano Prefecture, central Japan and its significance. Earth Science (Chikyu Kagaku) 61:67-72 [M. Clapham/M. Clapham]