Katsurazawa Lake, near Kikumenzawa Creek: Early Campanian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Nostoceratidae
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| see common names | |||||||
Geography
| Country: | Japan |
| Coordinates: | 43.2° North, 142.0° East (view map) |
| Paleocoordinates: | 51.3° North, 131.2° East (Wright 2013) |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late Cretaceous |
| Stage: | Campanian | 10 m.y. bin: | Cretaceous 7 |
| Key time interval: | Early Campanian | ||
| Age range of interval: | 83.6 - 72.2 m.y. ago |
Stratigraphy
| Geological group: | Yezo | Formation: | Nagareya | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Unit Ui-j, the lower part of the Nagareya Formation, mainly consists of mudstone, and its thickness is more than 350 m (Okamoto et al., 2003). Unit Ui-j contains Platyceramus japonicus, indicating the lowermost Campanian (Toshimitsu, 1988; Toshimitsu et al., 1995, 1998; Toshimitsu and Kikawa, 1997; Moriya and Hirano, 2001; Moriya et al., 2001; Okamoto et al., 2003; Toshimitsu et al., 2007). Platyceramus japonicus occurs only from this unit in the Haboro area (Okamoto et al., 2003). Obtained from the P. japonicus Zone in situ in the Mikasa area. | |||||
Lithology and environment
| Primary lithology: | concretionary lithified mudstone |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: Repository: Mikasa City Museum, Hokkaido | |
Metadata
| Database number: | 186850 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2017-07-05 19:42:38 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2017-07-05 19:42:38 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 62657. | D. Aiba, H. Yamato, K. Kurihara and T. Karasawa. 2017. A new species of Eubostrychoceras (Ammonoidea, Nostoceratidae) from the lower Campanian in the northwestern Pacific realm. Paleontological Research 21:255-264 [M. Clapham/M. Clapham] |