Shakubetsu Fm - Kushiro Coal Field: Early/Lower Oligocene, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Cipangopaludina isikariensis
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Semisulcospira fiscina
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| SUBSPECIES: S. fiscina yokoyamai | ||||||||||
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Gastropoda
- Potamididae
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Cerithidea matajiroi
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Gastropoda
- Thiaridae
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? Melanoides sp.
Olivier 1804
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Gastropoda
- Viviparidae
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Bellamya (Sinotaia) mabutii
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Gastropoda
- Naticidae
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Neverita (Neverita) sp.
Risso 1826
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Bivalvia
- Mytilida
- Mytilidae
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Modiolus sp.
(Lamarck 1801)
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Mytilus sp.
Linnaeus 1758
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Mytilus cf. luciferus
Yokoyama 1924
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Mytilus mabuchii
Oyama and Mizuno 1958
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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 sp.
Jameson 1901
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| synonym of Pinctada | ||||||||||
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Bivalvia
- Unionida
- Unionidae
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Anodonta subjapanensis
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| SUBSPECIES: A. subjapanensis yokoymau | ||||||||||
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Bivalvia
- Cardiida
- Corbiculidae
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Corbicula (Batissa) sitakaraensis
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Corbicula (Corbicula) tokudai
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Bivalvia
- Cardiida
- Cardiidae
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Nemocardium sp.
Meek 1876
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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: | Shakubetsu | ||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: Uppermost unit of the Urahoro Group, lying between the Shitakara Fm (Early Oligocene) and the Omagari Formation of the Ombetsu Group (presumably Late Oligocene). THICKNESS: Unknown thickness of unit. AGE: Presumably Early Oligocene; from near base of Oligocene 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: | 68895 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2007-02-12 18:27:11 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | group members | Released: | 2007-02-12 18:27:10 |
| 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] |