Kosawa abandoned quarry, Aikawa town: Piacenzian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Chondrichthyes
- Lamniformes
- Lamnidae
|
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| see common names | |||||||
Geography
| Country: | Japan |
| Coordinates: | 35.5° North, 139.3° East (view map) |
| Paleocoordinates: | 35.4° North, 138.7° East (Wright 2013) |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | outcrop |
Time
| Period: | Neogene | Epoch: | Pliocene |
| Stage: | Piacenzian | 10 m.y. bin: | Cenozoic 6 |
| Key time interval: | Piacenzian | ||
| Age range of interval: | 3.6 - 2.58 m.y. ago |
Stratigraphy
| Geological group: | Nakatsu | Formation: | Kanzawa | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Lowermost Kanzawa Formation, Nakatsu superformation (now group). The Kanzawa Formation assigned an age of 2.9->2.5 Ma in Nishimura et al. (2012) and 2.9-1.9 Ma by Aiba et al. (2010). Both suggest that the Kosawa-Kanzawa formation contact is late Piacenzian. | |||||
Lithology and environment
| Primary lithology: | unlithified sandstone |
| Environment: | coastal indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 277594 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham |
| Modifier: | M. Clapham | Research group: | vertebrate |
| Created: | 2026-01-31 19:38:30 | Last modified: | 2026-01-31 19:41:33 |
| Access level: | the public | Released: | 0000-00-00 00:00:00 |
| Creative Commons license: |
Reference information
Primary reference:
| 94080. | T. Uyeno and Y. Matsushima. 1975. Pliocene shark remains of Carcharodon, Carcharhinus, and Dalatias, from Kanagawa Prefecture, Japan. Bulletin of the Kanagawa Prefectural Museum, Natural Science 8:41-55 [M. Clapham/M. Clapham] |