Sz-13, Niranohama, Motoyoshi-gun, Miyagi Prefecture: Hettangian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Arietitidae
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Alsatites onoderai n. sp.
Matsumoto 1953
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| G1001, Department of Geology, Kyushu University (holotype) | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Japan |
| Coordinates: | 38.7° North, 141.5° East (view map) |
| Paleocoordinates: | 53.0° North, 171.5° East (Wright 2013) |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | small collection |
Time
| Period: | Jurassic | Epoch: | Early Jurassic |
| Stage: | Hettangian | 10 m.y. bin: | Jurassic 1 |
| Key time interval: | Hettangian | ||
| Age range of interval: | 201.4 - 199.5 m.y. ago |
Stratigraphy
| Geological group: | Shizukawa | Formation: | Niranohama | Member: | Upper |
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: The "Upper Member" of the Niranohama Formation is also known as the Trigonia Sandstone (Matsumoto 1956) | |||||
Lithology and environment
| Primary lithology: | lithified calcareous sandstone |
| Environment: | carbonate indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 221053 | ||
| Authorizer: | A. Dunhill | Enterer: | B. Allen |
| Created: | 2021-07-02 03:16:37 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2021-07-02 03:16:37 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 77307. | T. Matsumoto. 1956. Yebisites, a new Lower Jurassic ammonite from Japan. Transactions and Proceedings of the Paleontological Society of Japan. New Series 23:205-212 [A. Dunhill/B. Allen] |