USGS 17454a - Okinawa (Miocene to of Japan)

Where: Okinawa, Japan (26.1° N, 127.7° E: paleocoordinates 26.7° N, 126.7° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Shinzato Tuff Member (Shimajiri Formation), Late/Upper Miocene to Late/Upper Miocene (11.6 - 3.6 Ma)

• The uppermost part of the Shimajiri Formation. The Shinzato is fairly homogeneus, consisting for the most part of sandyy or silty clays with minor partings of ash. Its color ranges from dark gray to light gray. Its maximum known thickness is about 200 ft. The base of the formation is characterized by conglomeratic pumice, and in places chanels cut into the Yonabaru Clay Member.

• bed-level stratigraphic resolution

Environment/lithology: deep-water; 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.

Size class: macrofossils

Preservation: original aragonite

Reposited in the USNM

Collection methods: surface (float),

• Collections held in USNM and UGSG repositories.

Primary reference: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 42184: authorized by Austin Hendy, entered by Austin Hendy on 25.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropoda.
 Neogastropoda - Turridae
Pinguigemmula okinavensis MacNeil 1960 turrid