Okobykayskaya Suite (lower) - Okobykay Spring, Okha District, Sakhalin (Miocene of Russian Federation)

Where: Russian Federation (52.6° N, 143.2° E: paleocoordinates 52.9° N, 141.9° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Okobykayskaya Formation, Late/Upper Miocene (11.6 - 5.3 Ma)

• STRATIGRAPHIC RELATIONS: From the lower Okobykayskaya suite of the "Okobykay" horizon, which lies below the "Pomyrlower Nutov" (Late Miocene) and above the "Dagi" (Middle Miocene) horizons. THICKNESS: Total thickness of unit is 1450 m. AGE: Late Miocene, on the basis of classification into the "Okobykay" horizon. STRATIGRAPHIC POSITION: Composite checklist for lower part of the "formation" in this area.

• formation-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified sandstone and poorly lithified siltstone

• ENVIRONMENT: Not stated in text; assumed to be cool-water offshore setting on the basis of faunal composition.
• SPECIFIC LITHOLOGY: Interbeds of sandstones and siltstones. LITHIFICATION: Poorly-lithified, assumed on the basis of age and facies.

Size class: macrofossils

Collection methods: COLLECTOR: Unknown, presumably Polevoy (c. 1909). REPOSITORY: Unknown repository.

Primary reference: A. I. Kafanov and K. Ogasawara. 2003. Neogene and Paleogene Molluscan (Bivalvia) Cenozones of Sakhalin and Kurile Islands. Science Reports, Institute of Geoscience, University of Tsukuba 24:45-79 [A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 70532: authorized by Austin Hendy, entered by Austin Hendy on 27.03.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for bivalvia; no other groups listed. NOMENCLATURE: Not an authoritative publication, but nomenclature revised by specialists, with species and subgenus-level identifications.
Bivalvia
 Pectinida - Pectinoidae
Delectopecten peckhami Gabb 1869 scallop
 Cardiida - Tellinidae
"Macoma calcarea" = Macoma (Macoma) calcarea
"Macoma calcarea" = Macoma (Macoma) calcarea Gmelin 1792 tellin clam
 Cardiida - Veneridae
 Thraciida - Periplomatidae
 Nuculanida - Sareptidae
 Nuculanida - Nuculanidae
Propeleda schmidti pointed nut clam
 Nuculanida - Malletiidae
 Nuculanida - Yoldiidae
"Megayoldia (Portlandella) nitida" = Yoldia nitida Brocchi 1814 clam
Yoldia (Yoldia) vengeriana Kristofovich 1959 clam
 Nuculanida - Tindariidae
 Nuculida - Nuculidae
Acila (Truncacila) insignis divaricate nutclam