Oarashidani: Aptian, Japan
collected by Mr. Masatoshi Okura 1994
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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| 'fish scales' | ||||||||||
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Reptilia
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| isolated teeth of small ornithopods | ||||||||||
| isolated teeth of small crocodiles | ||||||||||
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Reptilia
- Testudines
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Kappachelys okurai n. gen., n. sp.
Hirayama et al. 2013
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2 specimens | |||||||||
| SBEI 1728 (holotype), an isolated, seventh left peripheral; SBEI 1729, an isolated, right seventh costal | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Japan | State/province: | Ishikawa | County: | Shiramine |
| Coordinates: | 36.2° North, 136.7° East (view map) | ||||
| Paleocoordinates: | 44.0° North, 146.9° East (Wright 2013) | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
Time
| Period: | Cretaceous | Epoch: | Early Cretaceous |
| Stage: | Aptian | 10 m.y. bin: | Cretaceous 3 |
| Key time interval: | Aptian | ||
| Age range of interval: | 121.4 - 113.2 m.y. ago |
Stratigraphy
| Geological group: | Tetori | Formation: | Akaiwa | Member: | 'alternation' |
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Lower or 'alternation' member, Akaiwa Formation, Tetori Group...probably late Neocomian [~Hauterivian]
Based on zircon U-Pb dating, the zircon grains from the tuff of the Akaiwa Formation of the Tetori Group in the Shiramine area which are correlated with the Nochino Formation has an age of 121.2 ± 1.1 Ma (Sakai et al., 2019). | |||||
Lithology and environment
| Primary lithology: | fine sandstone |
| Secondary lithology: | conglomerate |
| Includes fossils? | Y |
| Lithology description: Fine-grained sandstones that lie about 10 m below the first conglomerate bed, which is a distinct marker bed in that region | |
| Environment: | fluvial indet. |
| Geology comments: The lower or 'alternation member' consists of alternating beds of mudstones, fine sandstones, and coarse sandstones interbedded with conglomerates; this member was deposited in a meandering river system. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
| Collection methods: | surface (in situ),field collection | ||
| Reason for describing collection: | taxonomic analysis | ||
| Collectors: | Mr. Masatoshi Okura | Collection dates: | 2nd December 1994 |
| Collection method comments: SBEI collection, Shiramine Board of Education, Hakusan City, Ishikawa Prefecture, Japan. | |||
Metadata
| Also known as: | Shiramine area, Hakusan City | ||
| Database number: | 133613 | ||
| Authorizer: | R. Benson | Enterer: | R. Benson |
| Modifier: | G. Varnham | Research group: | vertebrate |
| Created: | 2012-09-19 02:27:33 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2012-09-19 02:27:33 |
| Creative Commons license: | CC0 | ||
Reference information
Primary reference:
| 43045. | R. Hirayama, S. Isaji, and T. Hibino. 2013. Kappachelys okurai gen. et sp. nov., a new stem soft-shelled turtle from the Early Cretaceous of Japan. In D. B. Brinkman, P. A. Holroyd, J. D. Gardner (eds.), Morphology and Evolution of Turtles 179-185 [R. Benson/R. Benson/P. Holroyd] |
Secondary references:
| 65859 | Y. Nakajima, I. G. Danilov, R. Hirayama, T. Sonoda, and T. M. Scheyer. 2017. Morphological and histological evidence for the oldest known softshell turtles from Japan. Journal of Vertebrate Paleontology 37(2):e1278606:1-11 [P. Mannion/P. Mannion] |