YBY-2 - Soun Mudstone Mbr, Yubetsu Fm, Akan district: Early Oligocene, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Bivalvia
- Venerida
- Corbiculidae
|
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| C category | |||||||
| see common names | |||||||
Geography
| Country: | Japan |
| Coordinates: | 43.3° North, 144.1° East (view map) |
| Paleocoordinates: | 45.9° North, 140.7° East (Wright 2013) |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Oligocene |
| Stage: | Rupelian | 10 m.y. bin: | Cenozoic 4 |
| Key time interval: | Early Oligocene | ||
| Age range of interval: | 33.9 - 27.3 m.y. ago |
Stratigraphy
| Formation: | Yubetsu | Member: | Soun Mudstone | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Soun Mudstone Mbr of the Yubetsu Fm of the Urahoro Gp, which overlies the Rushin Fm and is overlain by the Shitakara Fm, both of the Urahoro Gp (Early Oligocene). THICKNESS: From bed within unit 250-500 m thick. AGE: Early Oligocene based on molluscan biostratigraphy. STRATIGRAPHIC POSITION: Unknown position within formation. | |||||
Lithology and environment
| Primary lithology: | lithified sandstone |
| Secondary lithology: | lithified siltstone |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Sandstone, siltstone, coal and conglomerate. LITHIFICATION: Assumed to be lithifed on the basis of figured specimens and age. | |
| Environment: | coastal indet. |
| Geology comments: ENVIRONMENT: Coastal marine, siliciclastic environment. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: COLLECTOR: Presumably Y. Honda (c. 1989). REPOSITORY: Probably Tohoku University, Japan. | |
| Taxonomic list comments:COVERAGE: Exhaustive for gastropoda, bivalvia and scaphopoda. NOMENCLATURE: Authoritative publication, using moderately recent nomenclature, subgenus and species level designations. | |
Metadata
| Database number: | 70726 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2007-04-03 23:20:03 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | authorizer only | Released: | 2007-04-03 23:20:02 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 23698. | Y. Honda. 1989. Paleogene molluscan faunas from the Kushiro Coal Field, Eastern Hokkaido. Tohoku University, Science Report, 2nd series 60(1):1-137 [A. Hendy/A. Hendy] |