USGS M-277a, Ryukyu - Foster (1965) (Pliocene of Japan)

Also known as USGS M-277a

Where: Ryukyu, Japan (24.4° N, 124.2° E: paleocoordinates 24.6° N, 123.9° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Bunera Clay Member (Nagura Gravel Formation), Late/Upper Pliocene (3.6 - 2.6 Ma)

• The Bunera Clay member of the Nagura Gravel is generally overlain by Pleistocene gravel deposits and may rest unconformably on schist. The clay's thickness is unknown, though is less than 5 m at its type section.

• bed-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified, gray, blue, silty, sandy, calcareous claystone

• Offshore marine habitat on a muddy bottom of moderate depth.
• Medium to dark gray or bluish gray. It is silty or sandy in places and slightly calcareous

Size class: macrofossils

Preservation: original aragonite, original calcite

Reposited in the USNM

Collection methods: quarrying,

• Collections probably reposited in USGS and USNM. Identified by F.S. MacNeil

Primary reference: H. L. Foster. 1965. Geology of Ishigaki-shima Ryukyu-retto. United States Geological Survey Professional Paper 399(A):1-119 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 41601: authorized by Austin Hendy, entered by Austin Hendy on 17.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Forams and plant fossils are present in the Bunera Clay Member at these locations by are not listed.
Leucoma sp.
 Arcida - Arcidae
 Pterioida -
"Pecten aff. inaequivalvis" = Haumea inaequivalvis
"Pecten aff. inaequivalvis" = Haumea inaequivalvis Sowerby 1842 clam
 Carditida - Carditidae
"Cardita (Cyclocardia) sp." = Cyclocardia
"Cardita (Cyclocardia) sp." = Cyclocardia Conrad 1867 clam
 Cardiida - Veneridae
Paphia aurabilis venus clam
Circe sp. Schumacher 1817 venus clam
 Cardiida - Tellinidae
Tellina sp. Linnaeus 1758 tellin clam
 Cardiida - Cardiidae
Laevicardium sp. Swainson 1840 cockle
 Protobranchia - Nuculanidae
Nuculana radiatelirata pointed nut clam
 Cerithiacea - Cerithiidae
 Neogastropoda - Columbellidae
Anachis sp. Adams and Adams 1853 snail
 Neogastropoda - Muricidae
 Neogastropoda - Mangeliidae
"Mangelia ? sp." = Cythara (Mangelia)
"Mangelia ? sp." = Cythara (Mangelia) Loven 1846 snail
 Sorbeoconcha - Turritellidae
"Turritella cf. cingulifera" = Turritella (Kurosioia) cingulifera
"Turritella cf. cingulifera" = Turritella (Kurosioia) cingulifera Sowerby 1825 turret shell
 Trochoidea - Trochidae
Astele (Callistele) sp. Cotton and Godfrey 1935 top snail