USGS 17440 - Nakoshi Sand, Ryukyu Group, Okinawa (Pliocene of Japan)

Also known as ME 21

Where: Okinawa, Japan (26.6° N, 128.1° E: paleocoordinates 26.9° N, 127.5° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Nakoshi Sandstone Member, Early/Lower Pliocene (5.3 - 3.6 Ma)

• The Ryukyu Group is divisible into diconformable Pliocene and Plesitocene units. The lower sandy and silty part of the Ryukyu Group is divided into two geographic elemens, the Nakoshi Sand and the Chinen Sand. The Nakoshi Sand is assumed to be equivalent with the Chinen Sand. The Nakoshi sand is green to gray and locally it contains some soft, fine, light green silt, probably derived from nearby greenstones. The fossiliferous sand is underlain by an undetermined thickness of gravel. Presumably it is the basal conglomerate of the formation.

• bed-level stratigraphic resolution

Environment/lithology: coastal; gray, green sandstone

• Shallow water fauna compared to Chinen sand.
• Green to gray and localluty it contains some soft, fine, light green silt.

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 339:1-148 [A. Miller/C. Ferguson/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 42318: authorized by Austin Hendy, entered by Austin Hendy on 27.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropoda. No bivalves.
unclassified
  -
Gastropoda
 Neogastropoda - Buccinidae
 Neogastropoda - Nassariidae
"Nassarius (Niotha) gemmulatus" = Nassarius (Niotha) variegatus Adams 1851 snail
 Neogastropoda - Fasciolariidae
 Neogastropoda - Costellariidae
"Pusia cf. emmae" = Vexillum (Pusia) ribbed mitre
 Neogastropoda - Turridae
 Neogastropoda - Conidae
Conus cf. eburneus Bruguière 1792 cone shell
 Stromboidea - Strombidae
"Strombus (Lambiostrombus) cf. japonicus" = Strombus (Doxander) vittatus japonicus
"Strombus (Lambiostrombus) cf. japonicus" = Strombus (Doxander) vittatus japonicus Reeve 1851 conch
 Naticoidea - Naticidae
Polinices cf. cumingianus moon snail
Subspecies Polinices cf. cumingianus madioensis
 Xenophoroidea - Xenophoridae
"Tugurium exutum" = Stellaria (Onustus) exutus
"Tugurium exutum" = Stellaria (Onustus) exutus Reeve 1842 carrier shell
 Tonnoidea - Bursidae
"Bursa (Bufonaria) rana" = Bufonaria (Bufonaria) rana
"Bursa (Bufonaria) rana" = Bufonaria (Bufonaria) rana Linnaeus 1758 frog shell
 Tonnoidea - Cassidae
"Semicassis pila" = Semicassis bisulcata
"Semicassis pila" = Semicassis bisulcata Schubert and Wagner 1829 snail
 Sorbeoconcha - Turritellidae
Turritella filiola turret shell
 Sorbeoconcha - Cerithiidae
"Cerithium (Proclava) turritum" = Rhinoclavis (Proclava)
"Cerithium (Proclava) turritum" = Rhinoclavis (Proclava) cerith snail
 Architectonicoidea - Architectonicidae
Architectonica perspectiva Linnaeus 1767 sundial
 Turbinoidea - Turbinidae
Calcar sp. Montfort 1810 snail
"Lunatica marmorata" = Turbo (Lunatica) snail
 Trochoidea - Trochidae