Akaushi Port: Spathian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ceratitida
- Hemilecanitidae
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Cephalopoda
- Ceratitida
- Columbitidae
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Procolumbites subquadratus
Zakharov 1968
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Shigeta et al. 2024 | ||||||
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Procolumbites ussuriensis
(Zakharov 1968)
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Shigeta et al. 2024 | ||||||
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Neocolumbites grammi
Zakharov 1968
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Shigeta et al. 2024 | ||||||
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Cephalopoda
- Ceratitida
- Hellenitidae
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Hellenites tchernyschewiensis
Zakharov 1968
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Shigeta et al. 2024 | ||||||
| see common names | |||||||
Geography
| Country: | Japan |
| Coordinates: | 38.8° North, 141.5° East (view map) |
| Paleocoordinates: | 4.9° North, 138.8° East (Wright 2013) |
| Basis of coordinate: | stated in text |
| Geographic resolution: | outcrop |
Time
| Period: | Triassic | Epoch: | Early Triassic |
| Stage: | Olenekian | 10 m.y. bin: | Triassic 1 |
| Key time interval: | Spathian | ||
| Age range of interval: | 248.6 - 247 m.y. ago |
Stratigraphy
| Formation: | Osawa | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Lowest part of the Osawa Formation; early Spathian on the basis of ammonoid biostratigraphy. | |||||
Lithology and environment
| Primary lithology: | planar lamination lithified mudstone |
| Lithology description: Laminated mudstone | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | mold/impression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: Repository: National Museum of Nature and Science, Tsukuba (NMNS) | |
Metadata
| Also known as: | OS-A02 | ||
| Database number: | 226907 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2022-08-06 13:47:56 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2022-08-06 13:47:56 |
| Creative Commons license: | CC0 | ||
Reference information
Primary reference:
| 82377. | Y. Shigeta. 2022. Revision of early Spathian (late Olenekian, Early Triassic) ammonoids from the Osawa Formation at Akaushi in the Motoyoshi area, South Kitakami Belt, Northeast Japan. Paleontological Research 26:405-419 [M. Clapham/M. Clapham] |
Secondary references:
| 89801 | Y. Shigeta, Y. Endo, and H. Inose. 2024. Spathian (Late Olenekian, Early Triassic) ammonoids from the Osawa Formation, South Kitakami Belt, northeast Japan. Paleontological Research 28(s1):1-55 [M. Clapham/M. Clapham] |