MS35, Akkeshi Bay: Late Maastrichtian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Pachydiscidae
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Pachydiscus flexuosus
Matsumoto 1979
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| see common names | |||||||
Geography
| Country: | Japan |
| Coordinates: | 43.0° North, 144.7° East (view map) |
| Paleocoordinates: | 48.2° North, 136.4° 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: | Late Maastrichtian | ||
| Age range of interval: | 72.2 - 66 m.y. ago |
Stratigraphy
| Formation: | Senpohshi | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Middle Maastrichtian, chron 31n. | |||||
Lithology and environment
| Primary lithology: | lithified mudstone |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body,mold/impression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: Repository: National Museum of Nature and Science, Tsukuba | |
Metadata
| Database number: | 167908 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2015-04-06 21:41:50 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2015-04-06 21:41:50 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 54885. | Y. Shigeta, T. Nishimura, and K. Nifuku. 2015. Middle and late Maastrichtian (latest Cretaceous) ammonoids from the Akkeshi Bay area, eastern Hokkaido, northern Japan and their biostratigraphic implications. Paleontological Research 19:107-127 [M. Clapham/M. Clapham] |