Station 163A - Koyagi Fm, Takashima: Middle Eocene, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Ostreida
- Gryphaeidae
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| R category | ||||||||||
| COMMENTS: Spelt Pycnodonta | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Japan |
| Coordinates: | 33.0° North, 129.5° East (view map) |
| Paleocoordinates: | 38.7° North, 125.5° East (Wright 2013) |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Eocene |
| 10 m.y. bin: | Cenozoic 2-3 | ||
| Key time interval: | Middle Eocene | ||
| Age range of interval: | 48.07 - 37.71 m.y. ago |
Stratigraphy
| Formation: | Koyagi | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Koyagi Fm, which unconformably overlies Mesozoic metamorphic rocks and underlies the Futagojima Fm. THICKNESS: From bed in upper 110 m of formation, which attains a total thickness of nearly 1000 m. AGE: Middle Eocene, based on molluscan biostratigraphy. STRATIGRAPHIC POSITION: From bed near top of formation. | |||||
Lithology and environment
| Primary lithology: | coarse lithified sandstone |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Very coarse sandstone. LITHIFICATION: Presumed lithified on the basis of age. | |
| Environment: | coastal indet. |
| Geology comments: ENVIRONMENT: Shallow marine, siliciclastic environment.. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | surface (float),field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: COLLECTOR: A. Mizuno (c. 1964). REPOSITORY: Not stated in text, unknown. | |
| Taxonomic list comments:COVERAGE: Exhaustive for gastropoda and bivalvia. NOMENCLATURE: Farly modern nomenclature, and species-level assignments. | |
Metadata
| Database number: | 70963 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2007-04-12 19:27:50 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | authorizer only | Released: | 2008-04-12 19:27:50 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 23772. | A. Mizuno. 1964. Paleogene and Early Neogene molluscan faunae in West Japan. Geological Survey of Japan Report 204 [A. Hendy/A. Hendy] |