Also known as WF 240
Where: Okinawa, Japan (26.4° N, 127.7° E: paleocoordinates 26.5° N, 127.6° E)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Yontan Limestone Member, Early/Lower Pleistocene (2.6 - 0.8 Ma)
• The Yontan Limestone is the upper part of the Ryukyu Limestone. Some parts of the Yontan Limestone have a tecture similar to parts of the Naha Limestone, but in general the Yontan is coarser. Locally it consists of unsorted detrital fragments up to a foot in dimension. None of the fragments can be identified as Naha Limestone. The rock is highly porours to dense. The greatest observed thickness of the Yontan Limestone is about 200 ft, elsewhere the greatest thickness is around 40 ft. The Yontan Limestone rests on Paleozoic rocks, on beds of the Shimajiri Fm, or on the Naha Limestone. Its contact with the later is a wavy erosional discontinuity.
• bed-level stratigraphic resolution
Environment/lithology: poorly lithified, coarse-grained, conglomeratic limestone
Size class: macrofossils
Preservation: original aragonite
Collection methods: quarrying,
• 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 (339)1-148 [A. Miller/C. Ferguson/C. Ferguson] more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 42352: authorized by Austin Hendy, entered by Austin Hendy on 28.07.2004
Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)