Near Hitachinaka city (HI3): Late Campanian, Japan
collected 2020
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Osteichthyes
- Mosasauridae
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cf. Plotosaurus sp.
Camp 1951
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| INM-4-17907 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Japan | State/province: | Ibaraki |
| Coordinates: | 36.4° North, 140.6° East (view map) | ||
| Paleocoordinates: | 44.6° North, 133.6° East (Wright 2013) | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | small collection |
Time
| Period: | Cretaceous | Epoch: | Late Cretaceous |
| Stage: | Campanian | 10 m.y. bin: | Cretaceous 7 |
| Key time interval: | Late Campanian | ||
| Age range of interval: | 83.6 - 72.2 m.y. ago |
Stratigraphy
| Geological group: | Nakaminato | Formation: | Hiraiso | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: unit Hl3 of the Hiraiso Formation | |||||
Lithology and environment
| Primary lithology: | gray mudstone |
| Includes fossils? | Y |
| Lithology description: dark-gray mudstone | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Fragmentation: | frequent |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis | Collection dates: | 2020 |
Metadata
| Database number: | 231347 | ||
| Authorizer: | P. Mannion | Enterer: | P. Mannion |
| Created: | 2023-08-17 05:28:24 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2023-08-17 05:28:24 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 85666. | T. Kato, Y. Nakajima, K. Shiseki and H. Ando. 2021. Advanced mosasaurs from the Upper Cretaceous Nakaminato Group in Japan. Island Arc 30:e12431 [P. Mannion/P. Mannion] |