Okinoshima Fm (upper part) - Okinoshima (Eocene of Japan)

Where: Japan (32.7° N, 132.6° E: paleocoordinates 39.8° N, 127.9° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Okinoshima Formation, Late/Upper Eocene (37.2 - 33.9 Ma)

• STRATIGRAPHIC RELATIONS: From Okinoshima Fm, which regionally overlies the Middle Eocene Hashima Fm, and underlying the Lower Iojima Fm (Late Eocene). THICKNESS: From portion of formation that attains a thickness of ~200 m. AGE: Late Eocene, based on molluscan biostratigraphy. STRATIGRAPHIC POSITION: From upper part of formation.

• member-level stratigraphic resolution

Environment/lithology: coastal; lithified, fine-grained, medium, glauconitic, green sandstone

• ENVIRONMENT: Shallow sea, soft-bottom siliciclastic bottom.
• SPECIFIC LITHOLOGY: Green-colored, glauconite-bearing, fine-medium grained sandstone. LITHIFICATION: Presumed lithified on the basis of age.

Size class: macrofossils

Collection methods: surface (float),

• COLLECTOR: A. Mizuno (c. 1964). REPOSITORY: Not stated in text, unknown.

Primary reference: A. Mizuno. 1964. Paleogene and Early Neogene molluscan faunae in West Japan. Geological Survey of Japan Report 204 [A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 70920: authorized by Austin Hendy, entered by Austin Hendy on 11.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for gastropoda and bivalvia. NOMENCLATURE: Farly modern nomenclature, and species-level assignments.
unclassified
  -
Bivalvia
 Carditida - Carditidae
"Venericardia nipponica" = Venericardia (Venericor) nipponica Yokoyama 1911 clam
 Cardiida - Mactridae
Mactra sp. Linnaeus 1767 clam
 Cardiida - Veneridae
 Cardiida - Tellinidae
Angulus sp. Megerle 1811 tellin clam
 Solenida - Solenidae
Solena sp. Mörch 1853 clam
 Pholadomyida - Pholadomyidae
"Pholadomya "margaritacea"" = Pholadomya (Bucardiomya) margaritacea Sowerby 1821 clam
 Nuculida - Nuculidae
Gastropoda
 Neogastropoda - Fasciolariidae
 Neogastropoda - Volutidae
Volutospina japonica Nagao 1928 volute
 Neogastropoda - Tudiclidae
 Calyptraeoidea - Calyptraeidae
Calyptraea sp. Lamarck 1799 slipper shell
 Sorbeoconcha - Turritellidae
Colpospira yabei turret shell