SK2-15 - Shitakara Fm (middle), Akan district: Early/Lower Oligocene, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Naticidae
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Neverita sp.
Risso 1826
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R category | ||||||
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Gastropoda
- Neogastropoda
- Buccinidae
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Neptunea modestoidea
Takeda 1953
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C category | ||||||
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Bivalvia
- Ostreida
- Ostreidae
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Ostrea eorivularis
Oyama and Mizuno 1958
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R category | ||||||
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Bivalvia
- Cardiida
- Tellinidae
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Macoma sp.
Leach 1819
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F category | ||||||
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Bivalvia
- Pholadida
- Myidae
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Mya grewingki
(Makiyama 1934)
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A category | ||||||
| original and current combination Mya (Arenomya) grewingki | |||||||
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Bivalvia
- Lucinida
- Thyasiridae
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Conchocele bisecta
(Conrad 1849)
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R category | ||||||
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Bivalvia
- Carditida
- Carditidae
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Cyclocardia sp.
Conrad 1867
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F category | ||||||
| see common names | |||||||
Geography
| Country: | Japan |
| Coordinates: | 43.3° North, 144.1° East (view map) |
| Paleocoordinates: | 45.0° North, 141.3° East |
| 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/Lower Oligocene | ||
| Age range of interval: | 33.90000 - 27.82000 m.y. ago |
Stratigraphy
| Formation: | Shitakara | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Shitakara Fm of the Urahoro Gp, which overlies the Yubetsu Fm and is overlain by the Shakubetsu Fm, both of the Urahoro Gp (Early Oligocene). THICKNESS: From bed within unit 100-200 m thick. AGE: Early Oligocene based on molluscan biostratigraphy. STRATIGRAPHIC POSITION: From bed within middle part of the formation. | |||||
Lithology and environment
| Primary lithology: | lithified sandstone |
| Secondary lithology: | lithified conglomerate |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Sandstone, conglomerate, and siltstone. 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: | 70746 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2007-04-03 23:29:41 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | authorizer only | Released: | 2007-04-03 23:29:39 |
| Creative Commons license: | CC BY |
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] |