USGS 17451 - Okinawa (Miocene of Japan)

Also known as RS 369/22-323-9

Where: Japan (26.1° N, 127.7° E: paleocoordinates 26.8° N, 126.7° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Yonabaru Clay Member (Shimajiri Formation), Late/Upper Miocene (11.6 - 5.3 Ma)

• The Yonabaru Clay includes all Shimajiri Formation exposed below the upper tuffaceous pumiceous zone. The Yonabaru consists of bluish to gray silty to sandy clay, commonly with hackly to conchoidal fracture and fine dark-colored laminated to massive sand, weathering brown to gray, and in places contains large lime indurated concretions of sand. Most macrofossils are found in sandy beds intercalated with the clays. The Yonabaru passes under the cover of the basal gravels of the Naha limestone, and lap onto or are faukted against Paleozoic basement rocks.

• bed-level stratigraphic resolution

Environment/lithology: deep-water; poorly lithified, silty, sandy claystone and concretionary, brown, gray sandstone

• Molluscs found in assemblages of the Yonabaru Clay indicate moderately shallow to moderately deep water. Probably a depth of less than 100 fathoms in shallow facies and probably not more than 300 fathoms in deeper facies.
• Bluish to gray silty to sandy clay, commonly with hackly to conchoidal fracture and fine dark-colored laminated to massive sand, weathering brown to gray, and in places contains large lime indurated concretions of sand.

Size class: macrofossils

Preservation: original aragonite

Reposited in the USNM

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 42170: authorized by Austin Hendy, entered by Austin Hendy on 25.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropoda.
Gastropoda
 Ptenoglossa - Epitoniidae
 Cocculinoidea - Cocculinidae
 Neogastropoda - Olividae
Ancilla iwaensis olive snail
"Oliva aff. australis" = Oliva (Strephona) australis Duclos 1835 olive snail
 Neogastropoda -
"Ancilla (Baryspira) cf. albocallosa" = Amalda (Baryspira)
"Ancilla (Baryspira) cf. albocallosa" = Amalda (Baryspira) snail
 Neogastropoda - Buccinidae
Hindsia (Nihonophos) magnifica Lischke 1871 true whelk
Siphonalia mikado true whelk
Subspecies: Murex mikado makiyamai
 Neogastropoda - Fasciolariidae
Streptochetus paeteliana snail
Subspecies: Streptochetus paeteliana riukiuana
Pseudolatirus yonabaruensis MacNeil 1960 snail
 Neogastropoda - Mitridae
"Mitra (Fusimitra) loochooensis" = Fusimitra, "Mitra (Cancilla) yonabaruensis" = Cancilla, "Mitra (Cancilla) aff. menkrawitensis" = Cancilla, "Mitra (? Cancilla) sp." = Cancilla
"Mitra (Fusimitra) loochooensis" = Fusimitra mitre shell
"Mitra (Cancilla) yonabaruensis" = Cancilla mitre shell
"Mitra (Cancilla) aff. menkrawitensis" = Cancilla mitre shell
"Mitra (? Cancilla) sp." = Cancilla Swainson 1840 mitre shell
 Neogastropoda - Turbinellidae
"Afer aff. oostinghi" = Tudivasum (Afer)
"Afer aff. oostinghi" = Tudivasum (Afer) snail
 Neogastropoda - Muricidae
Ceratostoma brachypteron, "Murex cf. bonneti" = Murex (Haustellum) bonneti, Coralliophila (Hirtomurex) iwaensis, "Coralliophila (? Fusomurex) sp." = Hirtomurex
"Murex cf. bonneti" = Murex (Haustellum) bonneti Cossman 1903 murex snail
"Coralliophila (? Fusomurex) sp." = Hirtomurex Coen 1922 murex snail
 Neogastropoda - Drilliidae
 Neogastropoda - Turridae
 Neogastropoda - Raphitomidae
 Neogastropoda - Conidae
Conus cf. yabei cone shell
"Conus aff. djarianensis" = Conus (Lithoconus) djarianensis Martin 1895 cone shell
 Ficoidea - Ficidae
 Vanikoroidea - Hipponicidae
 Velutinoidea - Triviidae
 Naticoidea - Naticidae
Naticarius aff. concinnus Dunker 1859 moon snail
Euspira cf. pallida Broderip and Sowerby 1829 moon snail
Polinices cf. albumen Linnaeus 1758 moon snail
 Tonnoidea - Cassidae
Semicassis sp. M├Ârch 1852 snail
 Sorbeoconcha - Turritellidae
Turritella filiola turret shell
 Architectonicoidea - Architectonicidae
 Turbinoidea - Turbinidae
Bolma sp. n. sp.
Bolma sp. n. sp. Risso 1826 snail
 Trochoidea - Trochidae