Honmoku-Nishiki, Yokohama City: Calabrian, Japan
collected by Takashi Kitamura 1972
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Chondrichthyes
- Lamniformes
- Lamnidae
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Isurus oxyrinchus
Rafinesque 1810
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| see common names | |||||||
Geography
| Country: | Japan |
| Coordinates: | 35.4° North, 139.7° East (view map) |
| Paleocoordinates: | 35.4° North, 139.5° East (Wright 2013) |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | outcrop |
Time
| Period: | Quaternary | Epoch: | Pleistocene |
| Stage: | Calabrian | 10 m.y. bin: | Cenozoic 6 |
| Key time interval: | Calabrian | ||
| Age range of interval: | 1.8 - 0.774 m.y. ago |
Stratigraphy
| Geological group: | Kazusa | Formation: | Nakazato | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Nakazato Formation (Upper Silt). The Nakazato Formation is in the middle of the Kazusa Group. Nozaki et al. (2014) dated the underlying Nojima, Ofuna, and Koshiba Formations as early Calabrian on the basis of planktonic foraminifera, nannofossils, oxygen isotopes, and radiometric dating of ash layers. The Koshiba Formation, which directly underlies the Nakazato Formation, is around 1.48 to 1.63 Ma (MIS 49-57), so the Nakazato Formation is likely also early Calabrian. | |||||
Lithology and environment
| Primary lithology: | tuffaceous sandy siltstone |
| Lithology description: Sandy siltstone containing pumice | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis | ||
| Collectors: | Takashi Kitamura | Collection dates: | 1972 |
| Collection method comments: Repository: Kanagawa Prefectural Museum | |||
Metadata
| Database number: | 277592 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham | Research group: | vertebrate |
| Created: | 2026-01-31 18:53:19 | Last modified: | 2026-01-31 18:53:19 |
| Access level: | the public | Released: | 0000-00-00 00:00:00 |
| Creative Commons license: |
Reference information
Primary reference:
| 94079. | T. Uyeno and Y. Matsushima. 1974. Early Pleistocene remains of basking shark, hammerhead shark, and others found in Yokohama, Japan. Bulletin of the Kanagawa Prefectural Museum, Natural Science 7:57-66 [M. Clapham/M. Clapham] |