Kaijima Island: Rupelian, Japan
collected by Toshiyuki Kamei; Hideo Ikeuchi; Yoshihiko Okazaki
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Chondrichthyes
- Lamniformes
- Otodontidae
|
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| 6 specimens | ||||||||||
| Kamei specimen 1; Ikeuchi specimen 1, 3; KMNH VP 100,090; 100,091; 100,114 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Japan |
| Coordinates: | 34.0° North, 130.8° East (view map) |
| Paleocoordinates: | 36.5° North, 127.6° East (Wright 2013) |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Oligocene |
| Stage: | Rupelian | 10 m.y. bin: | Cenozoic 4 |
| Key time interval: | Rupelian | ||
| Age range of interval: | 33.9 - 27.3 m.y. ago |
Stratigraphy
| Formation: | Yamaga | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: The age of the Yamaga Formation in the Ashiya area was placed at 31.7±2.3 Ma (upper Lower Oligocene) based on fission track dating (Ozaki and Hamasaki, 1991). This was supported by further fission track dating and biostratigraphic studies conducted in the upper and lower formations (Tsuchi et al., 1987; Ozaki and Hamasaki, 1991; Okada, 1992). The Ashiya Group is correlated with the calcareous nannofossil Subzone CP19a of Okada and Bukry (1980) (Okada, 1992) and the planktonic foraminiferal Subzone P21a of Berggren and Miller (1988) (Ibaraki, 1994). | |||||
Lithology and environment
| Primary lithology: | "siliciclastic" |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | general faunal/floral analysis |
| Collectors: | Toshiyuki Kamei; Hideo Ikeuchi; Yoshihiko Okazaki |
| Collection method comments: Repository: Kitakyushu Museum of Natural History | |
Metadata
| Database number: | 278480 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham |
| Modifier: | M. Clapham | Research group: | vertebrate |
| Created: | 2026-03-24 19:59:35 | Last modified: | 2026-03-24 20:14:27 |
| Access level: | the public | Released: | 0000-00-00 00:00:00 |
| Creative Commons license: |
Reference information
Primary reference:
| 94412. | Y. Yabumoto. 1987. Oligocene lamnid shark of the genus Carcharodon from Kitakyushi, Japan. Bulletin of the Kitakyushu Museum of Natural History 6:239-264 [M. Clapham/M. Clapham] |