USGS 17484, Highway 60 (FSM 14) (Pleistocene to of Japan)

Where: Okinawa, Japan (26.2° N, 127.7° E: paleocoordinates 26.3° N, 127.5° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Naha Formation (Ryukyu Group), Calabrian to Calabrian (1.8 - 0.1 Ma)

• The lower part of the Riukiu Limestone is called the Naha Limestone. Naha Formation ranges from the middle Calabrian (c. 1.3 Ma) to the Middle Pleistocene (c. 0.4 Ma), according to Yamamoto et al. (2006).

• bed-level stratigraphic resolution

Environment/lithology: lagoonal or restricted shallow subtidal; poorly lithified, brown, white, calcareous grainstone and poorly lithified, brown, white limestone

• Probably is a reef limestone, but only coral rich in a few places. It is presumed that the Naha Limestone is a detrital lagoon deposit or a reef detritus deposited on an insular shelf. The lower part is more widespread that the upper part, probably reflecting erosion during deposition of the Yontan Limestone. The highest beds are less conglomeratic and generally contain abundant algal nodules.
• Poorly indurated medium to coarse grained lime sand, but other parts of it range from a powdery limestone to a dense nonporous limestone. It ranges in color from nearly white to brownish yellow.

Size class: macrofossils

Preservation: original aragonite

Collected by R. 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 42305: authorized by Austin Hendy, entered by Austin Hendy on 27.07.2004, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropoda. No bivalves.
Gastropoda
 Trochoidea - Turbinidae
"Angaria delphinus" = Delphinula delphinus, "Turbo petholatus" = Turbo (Turbo) petholatus, "Marmorostoma argyrostoma" = Turbo (Marmarostoma), Marmorostoma (Batillus) cf. cornuta
"Angaria delphinus" = Delphinula delphinus Linnaeus 1758 laciniated dolphin shell
"Turbo petholatus" = Turbo (Turbo) petholatus Linnaeus 1758 snail
"Marmorostoma argyrostoma" = Turbo (Marmarostoma) snail
 Trochoidea - Trochidae
Clanculus microdon top snail
Subspecies: Clanuculus microdon ater
 Lepetellida - Haliotidae
 Sorbeoconcha - Strombidae
Tibia sp. Röding 1798 true conch
 Neogastropoda - Mitridae
 Neogastropoda - Buccinidae
Cantharus (Pollia) sp. Sowerby 1843 true whelk
 Neogastropoda - Fasciolariidae
 Neogastropoda - Volutidae
Lyria rex volute
 Sorbeoconcha - Tonnidae
 Sorbeoconcha - Ranellidae
"Cymatium (Lampusia) cf. pileare" = Monoplex pilearis
"Cymatium (Lampusia) cf. pileare" = Monoplex pilearis Linnaeus 1758 triton shell
 Sorbeoconcha - Cypraeidae
"Cypraea (Lyncina) cf. carneola" = Lyncina carneola, "Cypraea (Lyncina) cf. arenosa" = Cypraea (Lyncina) schilderorum, "Erosaria (Ravitrona) helvola" = Cypraea (Erosaria) helvola, Cypraea sp.
"Cypraea (Lyncina) cf. carneola" = Lyncina carneola Linnaeus 1758 purple-mouthed cowry
"Cypraea (Lyncina) cf. arenosa" = Cypraea (Lyncina) schilderorum Iredale 1939 cowry
"Erosaria (Ravitrona) helvola" = Cypraea (Erosaria) helvola Linnaeus 1758 cowry
Cypraea sp. Linnaeus 1758 cowry
Rhynchonellata
 Terebratulida - Terebratulidae
Gryphus hanzawai Yabe and Hatai 1935
 Terebratulida - Frenulinidae
Pictothyris picta Dillwyn 1817