Yoh Iron Bridge: Tortonian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Chondrichthyes
- Lamniformes
- Otodontidae
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Carcharodon megalodon
(Agassiz 1843)
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| recombined as Otodus megalodon | |||||||
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Mammalia
- Dugongidae
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Dusisiren dewana n. sp.
Takahashi et al. 1986
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1 specimen | ||||||
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Mammalia
- Cetacea
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Cetacea indet.
Brisson 1762
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1 specimen | ||||||
| see common names | |||||||
Geography
| Country: | Japan | State/province: | Yamagata | County: | Nishimurayama |
| Coordinates: | 38.3° North, 140.2° East (view map) | ||||
| Paleocoordinates: | 39.9° North, 138.4° East | ||||
| Basis of coordinate: | stated in text |
Time
| Period: | Neogene | Epoch: | Miocene |
| Stage: | Tortonian | 10 m.y. bin: | Cenozoic 6 |
| Key time interval: | Tortonian | ||
| Age range of interval: | 11.62000 - 7.24600 m.y. ago |
Stratigraphy
| Formation: | Hongo | Member: | Hashigami Sandstone | ||
| Stratigraphy comments: Denticulopsis katayamae diatom zone, 9.0 to 10.4 Ma, late Miocene |
Lithology and environment
| Primary lithology: | "cross stratification",medium sandstone |
| Includes fossils? | Y |
| Lithology description: mdium to-very-coarse-grained sandstone exhibiting large scale trough cross stratification | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body,original phosphate |
| Size of fossils: | macrofossils |
| Articulated whole bodies: | all |
Collection methods and comments
| Reason for describing collection: | general faunal/floral analysis |
Metadata
| Also known as: | Yoh Ohe | ||
| Database number: | 71537 | ||
| Authorizer: | M. Uhen | Enterer: | M. Uhen |
| Modifier: | M. Uhen | Research group: | vertebrate |
| Created: | 2007-04-27 14:42:59 | Last modified: | 2019-10-01 22:16:21 |
| Access level: | the public | Released: | 2007-04-27 14:42:59 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 24176. | S. Takahashi, D. P. Domning, and T. Saito. 1986. Dusisiren dewana, n. sp. (Mammalia: Sirenia), a new ancestor of Stellers sea cow from the upper Miocene of Yamagata prefecture, northeastern Japan. Transactions and Proceedings of the Palaeontological Society of Japan N. S. 141:296-321 [M. Uhen/M. Uhen] |
Secondary references:
| 70357 | H. Furusawa. 2005. Evolution of the North Pacific Sirenia (Hydrodamalinae) and their paleoenvironment. Fossils 77:29-33 [M. Uhen/M. Uhen] |