USGS 17453, Asato (RS346, RS364) (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 Group. 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, tuffaceous, gray, silty, sandy claystone

• 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.
• 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 42186: 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.
Rhynchonellata
 Terebratulida - Frenulinidae
Jolonica macneili Cooper 1957
Gastropoda
 Sorbeoconcha - Campanilidae
Trochocerithium sp. Cossmann and Sacco 1896 snail
 Neogastropoda - Olividae
 Neogastropoda - Ancillariidae
"Ancilla (Baryspira) cf. albocallosa" = Amalda (Baryspira)
"Ancilla (Baryspira) cf. albocallosa" = Amalda (Baryspira) snail
 Neogastropoda - Drilliidae
 Neogastropoda - Raphitomidae
Typhlosyrinx sp. Thiele 1925 snail
 Neogastropoda - Turridae
 Neogastropoda - Buccinidae
 Sorbeoconcha - Naticidae
"Naticarius cf. niasensis" = Aloconatica niasensis
"Naticarius cf. niasensis" = Aloconatica niasensis Wissema 1947 moon snail
 Sorbeoconcha - Triphoridae