Tosano-sawa River, Tomiuchi: Cenomanian, Japan
collected by Mr. Toshimitsu Abe 1977
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
- Testudines
- Nanhsiungchelyidae
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Anomalochelys angulata n. gen., n. sp.
Hirayama et al. 2001
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1 specimen | |||||||||
HMG 1056. Large part of carapace with partial plastron attached | ||||||||||
see common names |
Geography
Country: | Japan | State/province: | Hokkaido | County: | Tomiuchi |
Coordinates: | 42.8° North, 142.1° East (view map) | ||||
Paleocoordinates: | 52.2° North, 136.3° East | ||||
Basis of coordinate: | estimated from map | ||||
Geographic resolution: | small collection |
Time
Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
Stage: | Cenomanian | 10 m.y. bin: | Cretaceous 5 |
Key time interval: | Cenomanian | ||
Age range of interval: | 100.50000 - 93.90000 m.y. ago |
Stratigraphy
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: Yezo supergroup (Late Cretaceous) exposed at Tosano-sawa River, Hobetsu-cho, Hokkaido Prefecture, North Japan (Fig. 1; Matsumoto and Toshimitsu, 1991). The geologic age of HMG 1056 was determined by radiolarian fossils extracted from associated matrix of calcareous siltstone (Kito et al., 1998). The well preserved assemblage, including Pseudodictyomitra pseudomacrocephala, Xitus mclaughlini, Torculum coronatum, Holocryptocanium cf. tuberculatum, H. barbui, Patellula spp., and Pyramispongia sp., indicates a Cenomanian age (Kito et al., 1998). This age is concordant with the age determined by ammonites such as Austiniceras cf. austeni (Sharpe) collected from a nearby locality at Tosanosawa River (Matsumoto and Toshimitsu, 1991). |
Lithology and environment
Primary lithology: | concretionary calcareous siltstone |
Includes fossils? | Y |
Lithology description: HMG 1056 was contained in a silty calcareous concretion | |
Environment: | terrestrial indet. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Collection methods and comments
Collection methods: | surface (float),surface (in situ),mechanical,acetic,field collection | ||
Reason for describing collection: | taxonomic analysis | ||
Collectors: | Mr. Toshimitsu Abe | Collection dates: | October 1977 |
Collection method comments: HMG collection, Hobetsu Museum, Hobetsu, Hokkaido Prefecture, Japan |
Metadata
Also known as: | Hobetsu-cho, Tosanosawa river | ||
Database number: | 129339 | ||
Authorizer: | R. Benson | Enterer: | R. Benson |
Modifier: | M. Carrano | Research group: | vertebrate |
Created: | 2012-06-23 03:33:29 | Last modified: | 2018-01-11 15:46:07 |
Access level: | the public | Released: | 2012-06-23 03:33:29 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
42115. | R. Hirayama, K. Sakurai, T. Chitoku, G. Kawakami, and N. Kito. 2001. Anomalochelys angulata, an unusual land turtle of family Nanhsiungchelyidae (superfamily Trionychoidea; order Testudines) from the Upper Cretaceous of Hokkaido, North Japan. Russian Journal of Herpetology 8(2):127-138 [R. Benson/R. Benson/R. Benson] |