Loc. 137 [Okinoshima Fm]: Late Eocene, Japan
collected by Kamada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Carditida
- Carditidae
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| R category | |||||||
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Bivalvia
- Pholadomyida
- Pholadomyidae
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Pholadomya margaritacea
(Sowerby 1821)
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R category | ||||||
| see common names | |||||||
Geography
| Country: | Japan |
| Coordinates: | 32.9° North, 129.6° East (view map) |
| Paleocoordinates: | 36.6° North, 126.0° East (Wright 2013) |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Priabonian | 10 m.y. bin: | Cenozoic 3 |
| Key time interval: | Late Eocene | ||
| Age range of interval: | 37.71 - 33.9 m.y. ago |
Stratigraphy
| Formation: | Okinoshima | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From the Okinoshima Fm, which conformably overlies the Hashima Fm and is unconformably overlain by the Iojima Fm. AGE: Late Eocene according to foraminiferal biostratigraphy in Asano (1958), and correlated to the Sakasegawa Shale. Kobayashi and Kamada (1959) suggest that the formation could even range from Middle-Late Eocene. STRATIGRAPHIC POSITION: From bed of unknown thickness within 150 m thick formation. | |||||
Lithology and environment
| Primary lithology: | lithified "siliciclastic" |
| Lithology description: SPECIFIC LITHOLOGY: Lithology not stated in text, but is likely siliciclastic. LITHIFICATION: Lithified, on the basis of figured specimens. | |
| Environment: | offshore |
| Geology comments: ENVIRONMENT: Neritic sediment probably at depth of 40-50 m. Subtropical warm sea. | |
Taphonomy
| Modes of preservation: | body,cast,mold/impression |
| Size of fossils: | macrofossils |
| Articulated whole bodies: | some |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Collection methods: | surface (in situ),field collection |
| Reason for describing collection: | paleoecologic analysis |
| Collectors: | Kamada |
| Collection method comments: COLLECTOR: Y. Kamada and graduates students Nagasaki University, c. 1950's. REPOSITORY: Nagasaki and Tokyo University. | |
| Taxonomic list comments:COVERAGE: Exhaustive for Bivalvia, Gastropoda, and Cephalopoda. NOMENCLATURE: Authoritative publication for cephalopods, but general for other taxa. Nomenclature is somewhat antiquated, but identified to species-resolution. | |
Metadata
| Database number: | 81228 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2008-06-11 08:07:16 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2008-06-11 08:07:16 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 27378. | T. Kobayashi and Y. Kamada. 1959. An Eocene Nautiloid from Kyushu, Japan. Japanese Journal of Geology and Geography 30:105-125 [A. Hendy/A. Hendy] |