USGS 17479 - Chinen Sand Member, Ryukyu Group, Okinawa: Early Pliocene, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Neogastropoda
- Turridae
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Gastropoda
- Tonnidae
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| see common names | |||||||
Geography
| Country: | Japan | State/province: | Okinawa |
| Coordinates: | 26.4° North, 128.0° East (view map) | ||
| Paleocoordinates: | |||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | outcrop |
Time
| Period: | Neogene | Epoch: | Pliocene |
| Stage: | Zanclean | 10 m.y. bin: | Cenozoic 6 |
| Key time interval: | Early Pliocene | ||
| Age range of interval: | 5.333 - 3.6 m.y. ago |
Stratigraphy
| Geological group: | Ryukyu | Member: | Chinen Sand | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Lower sand units were formely included in the Shimajiri beds, but they are disconformable with the underlying Shimajiri Formation. The lower sandy and silty part of the Ryukyu Group is divided into two elements, the Nakoshi Sand and the Chinen Sand. Presumably the two members are equivalent in age, but they are laterally not related. The Chinen sand is light gray to dark gray and more uniformely fine than the Nakoshi, and can have fine silt partings. | |||||
Lithology and environment
| Primary lithology: | fine,gray unlithified silty sandstone |
| Includes fossils? | Y |
| Lithology description: Light gray to dark gray, uniformely fine, can have fine silt partings. | |
| Environment: | marine indet. |
| Glacial or sequence phase: | transgressive |
| Geology comments: Probably reworked Shimajiri material during a transgression. Its deposition was followed immediately by a period during which reefs flourished and large ares were strewn with reef detritus. | |
Taphonomy
| Modes of preservation: | body,original aragonite |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | selective quarrying,field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: Collections held in USNM and UGSG repositories. | |
| Taxonomic list comments:Exhaustive for gastropoda. No bivalves. | |
Metadata
| Also known as: | TKRS 7 | ||
| Database number: | 42238 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2004-07-26 21:33:44 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | group members | Released: | 2005-07-26 21:33:44 |
| Creative Commons license: | CC0 | ||
Reference information
Primary reference:
| 7337. | F. S. MacNeil. 1960. Tertiary and Quaternary Gastropoda of Okinawa: A comparison of the late Miocene, Pliocene, and Pleistocene Gastropoda of Okinawa with related faunas of East Asia together with a resume of the geological setting of the fossiliferous deposits. United States Geological Survey Professional Paper 339:1-148 [A. Miller/C. Ferguson/P. Wagner] |