USGS D366, Ishigaki-shima - MacNeil (1964) (Eocene of Japan)

Also known as Is-DF-27-55

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)

• 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 41585: authorized by Austin Hendy, entered by Austin Hendy on 17.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative for mollusca
Bivalvia
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Carditida - Carditidae
? Cardita sp. Bruguière 1792 clam
 Pholadida - Corbulidae
"Caryocorbula cf. subtumida" = Caestocorbula subtumida
"Caryocorbula cf. subtumida" = Caestocorbula subtumida Nagao 1928 clam
 Cardiida - Cardiidae
"Cardium ishigakensis" = Plagiocardium ishigakensis
"Cardium ishigakensis" = Plagiocardium ishigakensis MacNeil 1964 cockle
Gastropoda
 Cephalaspidea - Bullidae
? Bulla sp. Linnaeus 1758 snail
 Cephalaspidea - Cylichnidae
? Scaphander sp. Monfort 1810 snail
 Architaenioglossa - Ampullinidae
 Neogastropoda - Olividae
"Ancillopsis japonica" = Ancillaria (Ancillopsis)
"Ancillopsis japonica" = Ancillaria (Ancillopsis) olive snail
 Neogastropoda - Fasciolariidae
? Mazzalina sp. Conrad 1860 snail
 Neogastropoda - Volutidae
 Neogastropoda - Terebridae
Terebra miyarensis auger snail
 Sorbeoconcha - Potamididae
 Sorbeoconcha - Turritellidae
Turritella kotakai turret shell
 Sorbeoconcha - Pachychilidae