Sapporo: Tortonian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Osteichthyes
- Sirenia
- Dugongidae
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Osteichthyes
- Cetacea
- Balaenidae
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Megabalaena sapporoensis n. gen., n. sp.
Tanaka et al. 2025
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Tanaka et al. 2025 | ||||||
| see common names | |||||||
Geography
| Country: | Japan | State/province: | Hokkaido |
| Coordinates: | 43.0° North, 141.2° East (view map) | ||
| Paleocoordinates: | 42.6° North, 139.4° East (Wright 2013) | ||
| Basis of coordinate: | based on nearby landmark |
Time
| Period: | Neogene | Epoch: | Miocene |
| Stage: | Tortonian | 10 m.y. bin: | Cenozoic 6 |
| Key time interval: | Tortonian | ||
| Age range of interval: | 11.63 - 7.246 m.y. ago |
Stratigraphy
| Formation: | Toyama |
Lithology and environment
| Primary lithology: | diatomaceous siltstone |
| 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: | 204973 | ||
| Authorizer: | M. Uhen | Enterer: | M. Uhen |
| Modifier: | M. Uhen | Research group: | vertebrate |
| Created: | 2019-10-01 22:15:09 | Last modified: | 2025-08-26 11:24:23 |
| Access level: | the public | Released: | 2019-10-01 22:15:09 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 70357. | H. Furusawa. 2005. Evolution of the North Pacific Sirenia (Hydrodamalinae) and their paleoenvironment. Fossils 77:29-33 [M. Uhen/M. Uhen] |
Secondary references:
| 92903 | Y. Tanaka, T. Kimura, T. Shinmura, H. Ohira, and H. Furusawa. 2025. A new member of a large and archaic balaenid from the Late Miocene of Sapporo, Hokkaido, Japan partly fills a gap of right whale evolution. Palaeontologia Electronica 28(2):a37 [M. Uhen/M. Uhen] |