Tsuzara, near Sasazu in Etchu: Burdigalian, Japan
collected by K. Masatani
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Nautilida
- Aturiidae
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Aturia minoensis
Kobayashi 1954
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| see common names | |||||||
Geography
| Country: | Japan |
| Coordinates: | 36.6° North, 137.2° East (view map) |
| Paleocoordinates: | 36.5° North, 134.4° East (Wright 2013) |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | outcrop |
Time
| Period: | Neogene | Epoch: | Miocene |
| Stage: | Burdigalian | 10 m.y. bin: | Cenozoic 5 |
| Key time interval: | Burdigalian | ||
| Age range of interval: | 20.45 - 15.98 m.y. ago |
Stratigraphy
| Geological group: | Yatsuo | Formation: | Kurosedani | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Upper part of Kurosedani Formation. Early Miocene planktonic zone N8 (late Burdigalian - mid-Langhian), diatom zone NPD 3A (late Burdigalian) according to Ozawa 2016. K-Ar and FT ages have been reported by Hayakawa (1983; FT age; 16.0±2.4 Ma), Nakajima and Mizushima (1984; FT age; 15.0±1.0 Ma), Hayakawa and Danhara (1986; FT age;16.8±0.9 Ma), Kaneko (2001; K-Ar age;13.8±0.4, 14.0±0.4 Ma) from tuffs of the Kurosedani Formation. The upper part of the Kurosedani Formation was determined to be of lower to middle Miocene age (17 to 15 Ma) using magnetostratigraphy (Tamaki et al., 2006). Yoshida et al. (2019) used Sr dating to obtain an age of 17.02 ± 0.27 Ma from a calcareous concretion. | |||||
Lithology and environment
| Primary lithology: | lithified mudstone |
| Environment: | submarine fan |
| Geology comments: "Turbidite deposits" according to Amano et al. (2019) | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
| Collectors: | K. Masatani |
| Collection method comments: Repository: Geological Institute, Hiroshima University | |
Metadata
| Database number: | 179852 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2016-07-02 21:19:24 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2016-07-02 21:19:24 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 59667. | T. Kobayashi and K. Masatani. 1955. On the occurrences of Aturia in provinces of Etchu and Iwami and their bearing on the palaeoflumenology in the Miocene of Japan. Transactions and Proceedings of the Paleontological Society of Japan, N.S. 17:1-4 [M. Clapham/M. Clapham] |