Kangawa River HS-Yoko-ST0003: Langhian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Chondrichthyes
- Squaliformes
- Centrophoridae
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Deania sp.
Jordan and Snyder 1902
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1 specimen | |||||||||
| HS-Yoko-ST0003 | ||||||||||
| 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: | Yokoo | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Upper member of the Yokoo Formation (all of the sharks described in Suzuki's papers come from different stratigraphic 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: Hideshi Suzuki collection | |
Metadata
| Database number: | 278402 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham | Research group: | vertebrate |
| Created: | 2026-03-19 22:05:40 | Last modified: | 2026-03-19 22:05:40 |
| Access level: | the public | Released: | 0000-00-00 00:00:00 |
| Creative Commons license: |
Reference information
Primary reference:
| 94354. | H. Suzuki. 2012. A fossil deep-sea shark assemblage from the Middle Miocene, Ueda City, Nagano Prefecture, central Japan. Earth Science (Chikyu Kagaku) 66:47-61 [M. Clapham/M. Clapham] |