Rushin Fm - Kushiro Coal Field: Early/Lower Oligocene, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
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Lanceolaria pisciformis
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Bivalvia
- Ostreida
- Ostreidae
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Ostrea eorivularis
Oyama and Mizuno 1958
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Bivalvia
- Ostreida
- Pteriidae
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Margaritifera perdahurica
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synonym of Pinctada | ||||||||||
Bivalvia
- Unionida
- Unionidae
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Anodonta subjapanensis
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INCLUDES: A. subjapanensis yokoyamai | ||||||||||
Unio uryuensis
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Bivalvia
- Cardiida
- Corbiculidae
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Corbicula (Batissa) sitakaraensis
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see common names |
Geography
Country: | Japan |
Coordinates: | 43.0° North, 144.4° East (view map) |
Paleocoordinates: | 44.8° North, 141.7° East |
Basis of coordinate: | based on nearby landmark |
Geographic resolution: | local area |
Time
Period: | Paleogene | Epoch: | Oligocene |
Stage: | Rupelian | 10 m.y. bin: | Cenozoic 4 |
Key time interval: | Early/Lower Oligocene | ||
Age range of interval: | 33.90000 - 27.82000 m.y. ago |
Stratigraphy
Geological group: | Urahoro | Formation: | Rushin | ||
Stratigraphic resolution: | formation | ||||
Stratigraphy comments: STRATIGRAPHIC RELATIONS: Basal formation of the Urahoro Group, which unconformably overlies the Late Cretaceous-Paleocene Kawarupu Formation of the Nemuro Group and is overlain by the Yubetsu Formation of the Urahoro Group (presumably also Early Oligocene). THICKNESS: Unknown thickness of unit. AGE: Presumably Early Oligocene; from basal unit of Oligocene age in region. STRATIGRAPHIC POSITION: Collection representative of entire formation in local area. |
Lithology and environment
Primary lithology: | fine,pebbly,gray lithified conglomeratic,carbonaceous sandstone |
Includes fossils? | Y |
Lithology description: SPECIFIC LITHOLOGY: Gray, poorly sorted, fine-grained sandstone and pebbly to granular conglomerate composed of chert pebbles, with intercalated coal seams. LITHIFICATION: Presumed lithified, on the basis of age, presence of coal, and low diversity of fauna. | |
Environment: | marginal marine indet. |
Geology comments: ENVIRONMENT: Non-marine through shallow marine. |
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: Unknown collected, possibly Y. Honda. REPOSITORY: Unknown repository. | |
Taxonomic list comments:COMPLETENESS: Authoritative for Mollusca. NOMENCLATURE: Slightly antiquated, but with consistent use of species level and subgeneric assignments. |
Metadata
Database number: | 68892 | ||
Authorizer: | A. Hendy | Enterer: | A. Hendy |
Modifier: | A. Hendy | Research group: | marine invertebrate |
Created: | 2007-02-12 14:41:32 | Last modified: | 2013-11-25 13:37:23 |
Access level: | group members | Released: | 2008-02-12 14:41:32 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
19891. | Y. Honda. 1986. A Paleogene molluscan fauna from Hokkaido, northern Japan. Paleontological Society of Japan Special Papers 29:3-15 [A. Hendy/A. Hendy] |