USGS 17442 - Chinen Sand Member, Ryukyu Group, Okinawa: Early Pliocene, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Trochidae
Gastropoda - Turritellidae
Gastropoda - Ovulidae
Gastropoda - Neogastropoda - Costellariidae
Gastropoda - Neogastropoda - Nassariidae
Gastropoda - Neogastropoda - Fasciolariidae
Gastropoda - Neogastropoda - Columbellidae
Gastropoda - Neogastropoda - Mitridae
Mitra (Cancilla) filaris (Linnaeus 1771)
Gastropoda - Neogastropoda - Turridae
Gastropoda - Neogastropoda - Clathurellidae
Gastropoda - Neogastropoda - Conidae
Conus aff. virgo Linnaeus 1758
Gastropoda - Neogastropoda - Horaiclavidae
unclassified
Gastropoda - Neogastropoda - Muricidae
Gastropoda - Tonnidae
Gastropoda - Ranellidae
Gastropoda - Naticidae
Polinices albumen (Linnaeus 1758)
Mammilla melanostoma (Gmelin 1791)
    = Tanea undulata Röding 1798
Majima 1989
Natica cf. vitellus (Linnaeus 1758)
Gastropoda - Heterostropha - Architectonicidae
Architectonica maxima (Philippi 1849)
see common names

Geography
Country:Japan State/province:Okinawa
Coordinates: 26.3° North, 127.9° 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: Fine gray sand. 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 sandstone
Includes fossils?Y
Lithology description: Fine gray sand
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:MD 25
Database number:42229
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2004-07-26 21:07:25 Last modified:2025-02-22 15:12:02
Access level:group members Released:2005-07-26 21:07:25
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]

Secondary references:

26376 R. Majima. 1989. Cenozoic fossil Naticidae (Mollusca: Gastropoda) in Japan. Bulletins of American Paleontology 96(331):1-159 [A. Hendy/A. Hendy]