USGS 17458, Gushichan (RS 351) (Pleistocene of Japan)

Where: Okinawa, Japan (26.1° N, 127.7° E: paleocoordinates 26.3° N, 127.5° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Shinzato Formation (Shimajiri Group), Gelasian (2.6 - 1.8 Ma)

• The uppermost part of the Shimajiri Formation. Shinzato member (now formation) spans calcareous nannoplankton zones CN12b just to the base of CN13, and planktonic foram zones PL5 and PL6 (UjiiĆ©, 1994), indicating a Gelasian age.

• bed-level stratigraphic resolution

Environment/lithology: deep-water; poorly lithified, gray, blue, silty sandstone

• 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.
• Blue gray silty sand. 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.

Size class: macrofossils

Preservation: original aragonite

Collected by Raymond A. Saplis; reposited in the USNM

Collection methods: quarrying,

Primary reference: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 42180: authorized by Austin Hendy, entered by Austin Hendy on 25.07.2004, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropoda.
Gastropoda
 Seguenzioidea - Eucyclidae
 Pseudomelanoidea - Pseudomelaniidae
 Neogastropoda - Buccinidae
 Neogastropoda - Nassariidae
"Nassarius (? Niotha) concinnus" = Nassarius (Zeuxis) concinnus
"Nassarius (? Niotha) concinnus" = Nassarius (Zeuxis) concinnus Powys 1835 snail
 Neogastropoda - Columbellidae
 Neogastropoda - Conidae
Conus cf. yabei cone shell
 Neogastropoda - Turridae
Gemmula sp. Weinkauff 1875 turrid
 Neogastropoda - Costellariidae
Makiyamaia coreanica Adams and Reeve 1850 ribbed mitre
Subspecies: Makiyamaia coreanica okinavensis
 Neogastropoda - Muricidae
"Coralliophila (Fusomurex) shimajiriensis" = Hirtomurex
"Coralliophila (Fusomurex) shimajiriensis" = Hirtomurex murex snail
 Sorbeoconcha - Cassidae
"Semicassis pila" = Semicassis bisulcata
"Semicassis pila" = Semicassis bisulcata Schubert and Wagner 1829 snail
 Sorbeoconcha - Ranellidae
Biplex perca triton shell
 Sorbeoconcha - Bursidae
Bursa (Tutufa) aff. corrugata Perry 1811 frog shell
 Sorbeoconcha - Xenophoridae
Xenophora sp. Fischer von Waldheim 1807 carrier shell
 Sorbeoconcha - Naticidae
Naticarius aff. concinnus Dunker 1859 moon snail
"Naticarius niasensis" = Aloconatica niasensis Wissema 1947 moon snail
 Sorbeoconcha - Triphoridae
Rhynchonellata
 Terebratulida - Cancellothyrididae
 Terebratulida - Terebratulidae
"Gryphus stearnsi" = Dolichozygus stearnsi
"Gryphus stearnsi" = Dolichozygus stearnsi Dall and Pilsbry 1891
 Terebratulida - Laqueidae
Laqueus elongatus Cooper 1957