Where: Okinawa, Japan (26.2° N, 127.8° E: paleocoordinates 26.2° N, 127.7° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Chinen Formation (Ryukyu Group), Calabrian (1.8 - 0.8 Ma)

• Upper beds just below limestone. Lower sand units were formely included in the Shimajiri beds, but they are disconformable with the underlying Shimajiri Formation. The lower sandy and silty part of the Ryukyu Group is divided into two elements, the Nakoshi Sand and the Chinen Sand. Presumably the two members are equivalent in age, but they are laterally not related. The Chinen sand is light gray to dark gray and more uniformely fine than the Nakoshi, and can have fine silt partings. Chinen sand belongs to calcareous nannoplankton zone CN13a and planktonic foram zone N22 (Ujiié, 1994), indicating a Calabrian age.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; unlithified, fine-grained, gray, silty sandstone

Size class: macrofossils

Preservation: original aragonite

Collected by F. Stearns MacNeil; reposited in the USNM

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 42233: authorized by Austin Hendy, entered by Austin Hendy on 26.07.2004, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)