USGS 17440 - Nakoshi Sand, Ryukyu Group, Okinawa: Early Pliocene, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Cassidae
Semicassis pila (Martin 1899)
Gastropoda - Bursidae
Bursa (Bufonaria) rana (Linnaeus 1758)
Gastropoda - Strombidae
Gastropoda - Neogastropoda - Pseudomelatomidae
Gastropoda - Neogastropoda - Conidae
Conus cf. eburneus Bruguière 1792
Gastropoda - Naticidae
Gastropoda - Neogastropoda - Buccinidae
Gastropoda - Neogastropoda - Nassariidae
Gastropoda - Neogastropoda - Fasciolariidae
Gastropoda - Neogastropoda - Costellariidae
Gastropoda - Xenophoridae
Tugurium exutum (Reeve 1842)
Gastropoda - Cerithiidae
Gastropoda - Turritellidae
Gastropoda - Heterostropha - Architectonicidae
Gastropoda - Turbinidae
Calcar sp. Montfort 1810
Gastropoda - Trochidae
unclassified
Gastropoda - Trochidae
see common names

Geography
Country:Japan State/province:Okinawa
Coordinates: 26.6° North, 128.1° 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:Nakoshi Sandstone
Local section:Nakoshi
Regional section:Okinawa
Stratigraphic resolution:bed
Stratigraphy comments: The Ryukyu Group is divisible into diconformable Pliocene and Plesitocene units. The lower sandy and silty part of the Ryukyu Group is divided into two geographic elemens, the Nakoshi Sand and the Chinen Sand. The Nakoshi Sand is assumed to be equivalent with the Chinen Sand. The Nakoshi sand is green to gray and locally it contains some soft, fine, light green silt, probably derived from nearby greenstones. The fossiliferous sand is underlain by an undetermined thickness of gravel. Presumably it is the basal conglomerate of the formation.
Lithology and environment
Primary lithology:gray,green sandstone
Includes fossils?Y
Lithology description: Green to gray and localluty it contains some soft, fine, light green silt.
Environment:coastal indet.
Glacial or sequence phase:transgressive
Geology comments: Shallow water fauna compared to Chinen sand.
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:ME 21
Database number:42318
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2004-07-27 22:57:52 Last modified:2025-02-22 15:12:02
Access level:the public Released:2004-07-27 22:57:52
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]