Aw16, Yamamoto: Early Maastrichtian, Japan
collected by Maeda
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Pachydiscidae
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Pachydiscus (Pachydiscus) aff. subcompressus
(Matsumoto 1954)
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| (1 measurement) | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Japan |
| Coordinates: | 34.2° North, 134.8° East (view map) |
| Paleocoordinates: | 40.1° North, 125.7° East (Wright 2013) |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late Cretaceous |
| Stage: | Maastrichtian | 10 m.y. bin: | Cretaceous 8 |
| Key time interval: | Early Maastrichtian | Ammonoid zone: | Pachydiscus subcompressus |
| Age range of interval: | 72.2 - 66 m.y. ago |
Stratigraphy
| Formation: | Shimonada | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Float nodule, probably derived from part of the Shimonada Formation. | |||||
Lithology and environment
| Primary lithology: | fine lithified sandy,calcareous siltstone |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | mold/impression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
| Collectors: | Maeda |
| Collection method comments: Repository: Department of Geology, Kyushu University | |
Metadata
| Database number: | 176814 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2016-03-03 01:31:37 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2016-03-03 01:31:37 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 58337. | Y. Morozumi. 1985. Late Cretaceous (Campanian and Maastrichtian) ammonites from Awaji Island, southwest Japan. Bulletin of the Osaka Museum of Natural History 39:1-58 [M. Clapham/M. Clapham] |