Hd0001 - Hidaka area [lower Yezo Gp]: Early Albian, Japan
collected by Shikama
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Orbitolinidae
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Orbitolina sp.
D'Orbigny 1850
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Gastropoda
- Heterostropha
- Nerineidae
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| see common names | |||||||
Geography
| Country: | Japan |
| Coordinates: | 43.0° North, 142.5° East (view map) |
| Paleocoordinates: | 37.1° North, 173.7° East (Wright 2013) |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Early Cretaceous |
| Stage: | Albian | 10 m.y. bin: | Cretaceous 4 |
| Key time interval: | Early Albian | ||
| Age range of interval: | 113.2 - 110.1 m.y. ago |
Stratigraphy
| Geological group: | Yezo | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From unknown formation in the Yezo Gp. AGE: Lower Albian. STRATIGRAPHIC POSITION: From limestone lenses, 5-7 m thick, 7 m, apart from one another in the lower part of the Yezo Gp. | |||||
Lithology and environment
| Primary lithology: | lithified "limestone" |
| Secondary lithology: | sandstone |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Thin alternations of sandstone and siliceous shale with intercalations of two lenses of Orbitolina-bearing limestone. LITHIFICATION: Lithified, on the basis of figured specimens. | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Collectors: | Shikama |
| Collection method comments: COLLECTOR: T. Shikama. REPOSITORY: Not stated in text. | |
| Taxonomic list comments:COVERAGE: Exhaustive for gastropods; other taxa (namely bivalves and foraminifera) often present. NOMENCLATURE: Authoritative publication, with relatively modern nomenclature, and species-resolution identifications. | |
Metadata
| Database number: | 91251 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2009-09-13 15:54:26 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2009-09-13 15:54:26 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 30704. | T. Kase. 1984. Early Cretaceous marine and brackish-water Gastropoda from Japan 1-262 [A. Hendy/A. Hendy] |