USGS 17473, Itoman (RS 383): Calabrian - Middle Pleistocene, Japan
collected by Raymond A. Saplis

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Cerithiidae
MacNeil 1960
Gastropoda - Tonnidae
MacNeil 1960
Gastropoda - Turbinidae
Turbo petholatus Linnaeus 1758
MacNeil 1960
Rhynchonellata - Terebratulida - Frenulinidae
Jolonica ryukyuensis Yabe and Hatai 1935
Rhynchonellata - Terebratulida - Dallinidae
Campages nipponensis (Yabe and Hatai 1935)
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: Calabrian - Chibanian 10 m.y. bin: Cenozoic 6
Key time interval: Calabrian - Middle Pleistocene
Age range of interval: 1.8 - 0.129 m.y. ago
Stratigraphy
Geological group:Ryukyu Formation:Naha
Stratigraphic resolution:bed
Stratigraphy comments: Naha Formation ranges from the middle Calabrian (c. 1.3 Ma) to the Middle Pleistocene (c. 0.4 Ma), according to Yamamoto et al. (2006).
Lithology and environment
Primary lithology:brown,white poorly lithified calcareous grainstone
Secondary lithology:brown,white poorly lithified "limestone"
Includes fossils?Y
Includes fossils?Y
Lithology description: Poorly indurated medium to coarse grained lime sand, but other parts of it range from a powdery limestone to a dense nonporous limestone. It ranges in color from nearly white to brownish yellow.
Environment:lagoonal/restricted shallow subtidal
Glacial or sequence phase:transgressive
Geology comments: Probably is a reef limestone, but only coral rich in a few places. It is presumed that the Naha Limestone is a detrital lagoon deposit or a reef detritus deposited on an insular shelf. The lower part is more widespread that the upper part, probably reflecting erosion during deposition of the Yontan Limestone. The highest beds are less conglomeratic and generally contain abundant algal nodules.
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. No bivalves.
Metadata
Database number:42307
Authorizer:A. Hendy, M. Clapham Enterer:A. Hendy, M. Clapham
Modifier:M. Clapham Research group:marine invertebrate
Created:2004-07-27 13:14:47 Last modified:2025-02-22 15:12:02
Access level:the public Released:2004-07-27 13:14:47
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]