Loc. Y5281 - River Hakkinzawa [Yezo Gp]: Early Cenomanian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Scaphitidae
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Scaphites sp.
Parkinson 1811
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Cephalopoda
- Ammonitida
- Desmoceratidae
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Desmoceras kossmati
Matsumoto 1942
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Cephalopoda
- Ammonitida
- Tetragonitidae
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Parajaubertella sp.
Matsumoto 1942
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| see common names | |||||||
Geography
| Country: | Japan | County: | Hokkaido |
| Coordinates: | 43.0° North, 142.0° East (view map) | ||
| Paleocoordinates: | 49.3° North, 147.3° East (Wright 2013) | ||
| Basis of coordinate: | stated in text | ||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late Cretaceous |
| Stage: | Cenomanian | 10 m.y. bin: | Cretaceous 5 |
| Key time interval: | Early Cenomanian | ||
| Age range of interval: | 100.5 - 93.9 m.y. ago |
Stratigraphy
| Geological group: | Yezo | ||||
| Local section: | River Hakkinzawa | Local bed: | 108.8 m | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From unnamed lithostratigraphic unit within the middle Yezo Gp, which unconformably overliesthe late Mesozoic Sorachi Gp, and is overlain by Cenozoic strata. AGE: Early Cenomanian, on the basis of ammonite and inoceramid biostratigraphy. STRATIGRAPHIC POSITION: From near base of regional section. | |||||
Lithology and environment
| Primary lithology: | tuffaceous lithified mudstone |
| Secondary lithology: | lithified sandstone |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Mudstone with thin but frequent intercalates of fine sandstone and acid bentonite tuff. LITHIFICATION: | |
| Environment: | coastal indet. |
| Geology comments: ENVIRONMENT: Marine siliciclastic setting. | |
Taphonomy
| Modes of preservation: | cast,mold/impression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some genera |
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: COLLECTOR: H. Hirano, T. Matsumoto, and K. Tanabe, 1970's. REPOSITORY: Dept. of Geology, Kyushu University. | |
| Taxonomic list comments:COVERAGE: Limited to representative ammonoids and inoceramids. NOMENCLATURE: Not an authoritative publication, but with fairly modern nomenclature and species-resolution identifications. | |
Metadata
| Database number: | 86983 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | G. Palazzo | Research group: | marine invertebrate |
| Created: | 2009-02-26 21:30:50 | Last modified: | 2026-05-18 18:28:41 |
| Access level: | the public | Released: | 2009-02-26 21:30:50 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 29265. | H. Hirano, T. Matsumoto, and K. Tanabe. 1977. Mid-Cretaceous stratigraphy of the Oyubari area, central Hokkaido. Palaeontological Society of Japan Special Papers 21:1-10 [A. Hendy/A. Hendy] |