USGS D361, Ishigaki-shima - MacNeil (1964) (Eocene of Japan)

Also known as Is-DF-22-55

Where: Japan (24.5° N, 124.3° E: paleocoordinates 28.9° N, 121.3° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Miyara Formation, Middle Eocene (48.6 - 37.2 Ma)

• Approximately in the middle of an estimated 20 ft of conglomerate. Conglomerate bed in bedded volcanics. The Miyara Formation rests on the eerosional surface of an intensely folded Paleozoic formation, and is overlain by the Miocene Yaeyama coal-bearing group. Foraminifera support an upper Eocene age, while molluscs confirm a middle Miocene age

• bed-level stratigraphic resolution

Environment/lithology: coastal; pebbly, gray, green, argillaceous, sandy, calcareous conglomerate

• Conglomerate of subrounded to rounded pebbles derived from the Ishigaki Group embedded in a gray, greenish-gray, reddish-brown or tan sandy, clayey, or limey matrix

Size class: macrofossils

Preservation: original aragonite, original calcite

Reposited in the USNM

Collection methods: quarrying,

• Collected by H.L. (1955). Reposited in the USGS of USNM collections

Primary reference: F.S. MacNeil. 1964. Eocene megafossils from Ishigaki-shima Ryukyu-retto. United States Geological Survey Professional Paper 399(B):1-14 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 41587: authorized by Austin Hendy, entered by Austin Hendy on 17.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative for mollusca
Gastropoda
 Sorbeoconcha - Turritellidae
Turritella kotakai turret shell