USGS 17495 - Chinen Sand Member, Ryukyu Group, Okinawa: Early/Lower Pliocene, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda
- Cerithiidae
|
|||||||
Cerithium (Proclava) kobelti
|
|||||||
spelled with current rank as Rhinoclavis (Proclava) | |||||||
Gastropoda
- Strombidae
|
|||||||
? Strombus sp.
Linnaeus 1758
|
|||||||
Gastropoda
- Neogastropoda
- Nassariidae
|
|||||||
Nassarius (Niotha) fulleri
|
|||||||
Nassarius (Hinia) prefestivus
|
|||||||
see common names |
Geography
Country: | Japan | State/province: | Okinawa |
Coordinates: | 26.4° North, 127.8° East (view map) | ||
Paleocoordinates: | 26.7° North, 127.3° East | ||
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/Lower Pliocene | ||
Age range of interval: | 5.33300 - 3.60000 m.y. ago |
Stratigraphy
Geological group: | Ryukyu | Member: | Chinen Sand | ||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: Blue-gray silty clay underlying oyster bearing gravels. 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: | gray,blue unlithified silty claystone |
Includes fossils? | Y |
Lithology description: Blue-gray silty clay. | |
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: | WF 253 | ||
Database number: | 42234 | ||
Authorizer: | A. Hendy | Enterer: | A. Hendy |
Modifier: | A. Hendy | Research group: | marine invertebrate |
Created: | 2004-07-26 21:33:12 | Last modified: | 2013-11-25 13:37:23 |
Access level: | group members | Released: | 2005-07-26 21:33:12 |
Creative Commons license: | CC BY |
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] |