USGS 17453, Asato (RS346, RS364): Gelasian, Japan
collected by Raymond A. Saplis

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Campanilidae
Trochocerithium sp. Cossmann and Sacco 1896
MacNeil 1960
Gastropoda - Triphoridae
MacNeil 1960
Gastropoda - Neogastropoda - Olividae
MacNeil 1960
Gastropoda - Neogastropoda - Ancillariidae
MacNeil 1960
Gastropoda - Neogastropoda - Turridae
MacNeil 1960
MacNeil 1960
Gastropoda - Neogastropoda - Raphitomidae
Typhlosyrinx sp. Thiele 1925
MacNeil 1960
Gastropoda - Neogastropoda - Drilliidae
MacNeil 1960
Gastropoda - Neogastropoda - Cominellidae
MacNeil 1960
Gastropoda - Naticidae
MacNeil 1960
Rhynchonellata - Terebratulida - Frenulinidae
see common names

Geography
Country:Japan State/province:Okinawa
Coordinates: 26.1° North, 127.7° East (view map)
Paleocoordinates:
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Quaternary Epoch: Pleistocene
Stage: Gelasian 10 m.y. bin: Cenozoic 6
Key time interval: Gelasian
Age range of interval: 2.58 - 1.8 m.y. ago
Stratigraphy
Geological group:Shimajiri Formation:Shinzato
Stratigraphic resolution:bed
Stratigraphy comments: The uppermost part of the Shimajiri Group. Shinzato member (now formation) spans calcareous nannoplankton zones CN12b just to the base of CN13, and planktonic foram zones PL5 and PL6 (Ujiié, 1994), indicating a Gelasian age.
Lithology and environment
Primary lithology:tuffaceous,gray poorly lithified silty,sandy claystone
Includes fossils?Y
Lithology description: Consists for the most part of sandy or silty clays with minor partings of ash. Its color ranges from dark gray to light gray. Poorly lithified based on fossil preservation.
Environment:deep-water indet.
Geology comments: Molluscs found in assemblages of the Shinzato Tuff Member occur in depths as much as 300 m, although some can be in shallower water. Generally the assemblage should be regarded as deep-water.
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
Museum repositories:USNM
Collectors:Raymond A. Saplis
Taxonomic list comments:Exhaustive for gastropoda.
Metadata
Database number:42186
Authorizer:A. Hendy, M. Clapham Enterer:A. Hendy, M. Clapham
Modifier:M. Clapham Research group:marine invertebrate
Created:2004-07-25 20:05:52 Last modified:2025-02-22 15:12:02
Access level:the public Released:2004-07-25 20:05:52
Creative Commons license:CC0
Reference information

Primary reference:
39467. G. A. Cooper. 1957. Tertiary and Pleistocene Brachiopods of Okinawa, Ryukyu Islands. United States Geological Survey Professional Paper 314(A):1-20 [A. Hendy/A. Hendy]

Secondary references:

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]