Machigarskaya Suite - Schmidt Peninsula, Okha District, Sakhalin (Oligocene of Russian Federation)

Where: Russian Federation (54.2° N, 142.6° E: paleocoordinates 55.9° N, 139.5° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Machigarskaya Formation, Early/Lower Oligocene (33.9 - 28.4 Ma)

• STRATIGRAPHIC RELATIONS: From the Machigarskaya suite of the "Machigar" horizon, which lies above Eocene coal-bearing layers (Late Miocene) and "Daekhuriin" horizons. THICKNESS: Total thickness of unit is 600 m. AGE: Early Pliocene, on the basis of classification into the "Machigar" horizon. STRATIGRAPHIC POSITION: Composite checklist for upper part of the "formation" in this area.

• formation-level stratigraphic resolution

Environment/lithology: coastal; unlithified, argillaceous, silty, conglomeratic, calcareous, carbonaceous sandstone

• ENVIRONMENT: Not stated in text; assumed to be cool-water coastal setting on the basis of faunal composition.
• SPECIFIC LITHOLOGY: Conglomeratic sandstone, with alternations of argillites with conglomerates, limey sandstones, with coal beds, and siltstones. LITHIFICATION: Poorly-lithified, assumed on the basis of age and facies.

Size class: macrofossils

Collection methods: COLLECTOR: Unknown, presumably Uwatoko (c. 1937). 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 70518: 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
 Arcida - Arcidae
Arca (Arca) sakamizuensis Hatai and Nisiyama 1952 ark
 Arcida - Glycymerididae
 Pectinida - Pectinoidae
Chlamys (Chlamys) gackhense Kristofovich and Ilyina 1963 scallop
Chlamys matchgarensis Makiyama 1934 scallop
COMMENTS: sensu lato
 Pectinida - Anomiidae
"Monia schmidti" = Pododesmus (Monia)
"Monia schmidti" = Pododesmus (Monia) scallop
 Mytilida - Crenellidae
 Mytilida - Mytilidae
 Carditida - Carditidae
 Pholadida - Myidae
Mya (Arenomya) grewingki Makiyama 1934 softshell clam
 Cardiida - Corbiculidae
 Cardiida - Veneridae
Liocyma furtiva venus clam
 Cardiida - Tellinidae
Macoma sejugata tellin clam
Macoma asagaiensis tellin clam
Macoma simizuensis Krishtofovich 1957 tellin clam
"Macoma cf. golikovi" = Macoma (Macoma) golikovi Scarlato and Kafanov 1988 tellin clam
 Cardiida - Psammobiidae
 Cardiida - Cardiidae
 Hiatellida - Hiatellidae
"Hiatella cf. arctica" = Hiatella (Hiatella) arctica
"Hiatella cf. arctica" = Hiatella (Hiatella) arctica Linnaeus 1767 clam
 Thraciida - Periplomatidae
 Thraciida - Thraciidae
 Lucinida - Thyasiridae
 Lucinida - Lucinidae
Lucinoma acutilineata Conrad 1849 clam
 Nuculida - Nuculidae
"Leionucula yotsukurensis" = Nucula (Leionucula) nut clam
"Leionucula matschigarica" = Nucula (Leionucula) nut clam
Acila (Truncacila) oyamadensis divaricate nutclam
Acila (Truncacila) plana divaricate nutclam
 Protobranchia - Sareptidae
 Protobranchia - Nuculanidae
"Nuculana (Saccella) praefurlongi" = Saccella
"Nuculana (Saccella) praefurlongi" = Saccella pointed nut clam
 Protobranchia - Yoldiidae
Yoldia (Nampiella) laudabilis Yokoyama 1924 clam
Yoldia (Sachalinella) matschigarica Kristofovich 1964 clam
"Megayoldia (Portlandella) nitida" = Yoldia nitida Brocchi 1814 clam