Takami, Ohnan-town: Burdigalian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Osteichthyes
- Carnivora
- Odobenidae
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| 1 specimen | |||||||
| see common names | |||||||
Geography
| Country: | Japan | State/province: | Shimane | County: | Ohchi |
| Coordinates: | 34.9° North, 132.6° East (view map) | ||||
| Paleocoordinates: | 34.6° North, 129.9° East (Wright 2013) | ||||
| Basis of coordinate: | stated in text |
Time
| Period: | Neogene | Epoch: | Miocene |
| Stage: | Burdigalian | 10 m.y. bin: | Cenozoic 5 |
| Key time interval: | Burdigalian | ||
| Age range of interval: | 20.45 - 15.98 m.y. ago |
Stratigraphy
| Formation: | Takami | Member: | Irino | ||
| Stratigraphy comments: Sakanoue (1995) correlated the Takami Formation with the Bihoku Group in the Shobara-Miyoshi area near the study site, where the biostra- tigraphy has been clarified. According to this study, the Irino Sandstone Member is correlated with the Korematsu Formation of the lower part of the Bihoku Group. Yamamoto (1999) reported calcareous nannofossils from the Korematsu Formation and the overlying lower part of the Itabashi Formation in the Shobara area and correlated them with Zone NN4 of Martini (1971). Watanabe et al. (1999) reported fossil diatoms from the upper part of the Bihoku Group in the Koyamaichi area, approximately 30 km southeast of the Shobara area, and correlated it with Zones NPD3A to lower NPD4A of Yanagisawa and Akiba (1998). These studies showed that the Irino Sandstone Member is estimated probably at 16.9–16.3 Ma in age, and the horizon of the new mandible specimen is assigned to approximately 16.5 Ma (late Burdigalian).
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Lithology and environment
| Primary lithology: | muddy sandstone |
| Includes fossils? | Y |
| Environment: | coastal indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | general faunal/floral analysis |
Metadata
| Database number: | 227079 | ||
| Authorizer: | M. Uhen | Enterer: | M. Uhen | Research group: | vertebrate |
| Created: | 2022-09-02 13:27:09 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2022-09-02 13:27:09 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 82512. | W. Tonomori. 2022. First report of Neotherium mandible from the Miocene Shimane, Japan: Review of basal odobenids in the western North Pacific. Historical Biology 34(1):52-61 [M. Uhen/M. Uhen] |