Neogene

Paleogene

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

Mesoproterozoic

Paleoproterozoic

Main source = Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian) Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

Kokchin-Carb Formation

Kokchin-Carb Fm

Period:

Carboniferous

Age Interval:

Lower Moscovian, N8

Province:
Nuratau

Type Locality and Naming

Along the Kokcha River, southwestern end of the South Nuratau Range. M.N. Solovieva, V.D. Chekhovich, 1954 (425, p. 549). Stratotype on the Kokcha River. KOKCHIN HORIZON -Based on the Kokchin suite. V.A. Arapov, Z.S. Rumyantseva, 1972 (166, p. 267). Stratotype - the eponymous suite, Kokcha River, lectostratotype in the area of the Belkuduk mine, Muruntau Mountains, Central Kyzylkum (386).

Synonym: Kokchin Suite, Кокчинская св., Kokchin Horizon

Lithology and Thickness

Dark thin-bedded biomorphic and detrital algal-foraminiferal limestones, with bauxites and bauxitic rocks at the base. Thickness 200-250m.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Unconformably overlies the limestones of the Zafarabad Fm. Kokchin Horizon - Lies at the base of the Moscovian stage

Upper contact

Overlying deposits are not established. (165; 439; 460). Kokchin Horizon - overlain by the Kelvasai Horizon.

Regional extent

Southwestern end of the South Nuratau Range, Kokcha River. The complex of horizons is present in the Kokchin suite (Kokcha River), the lower part of the North Muruntau Fm (Aktau, Muruntau Mountains), the middle part of the Kal'makbulak Fm (Karachatyryr Mountain), the middle part of the Sagdor Fm (southern slope of the Gissar Range).

GeoJSON

null

Fossils

Contains Foraminifers - Asteroarchaediscus Ex Gr. Baschkiricus (Krest. Et Theod.), Eostaffella Exilis Grozd. Et Leb., Pseudostaffella Antiqua (Dutk.), Neostaffella Pseudoquadrata (Man.), Ozawainella Alchevskiensis Pot., O. Facoides Man., O. Pararhomboides Man., Reitlingerina Timanica (Raus.), R. Subrhomboides (Raus.), Depratina Praeprisca (Sol.), Ovatella Ovata (Raus.), Profusulinella Biconiformis Kir., P. Mutabilis Saf., Taitzehoella Prolibrovichi (Raus.), Skelnevatella Artificialis (Leont.).

Kokchin Horizon - Corresponds to the foraminiferal zone Aljutovella aljutovica. Includes - Schubertella pauciseptata Raus., Ozawainella alchevskiensis Pot., Profusulinella convoluta Lee et Chen, P.? mutabilis Saf., Ovatella ovata (Raus.), Depratina prisca(Depr.), Skelnevatella skelnevatica (Putrja), S. artificialis (Leont.), S. postaljutovica (Saf.), Aljutovella aljutovica (Raus.), A. elongata (Raus.), Verella imperplana Rum., V. postfusiformis Bensh, Paraeofusulina trianguliformis (Putrja), Eofusulina triangula (Raus. et Bel.), Dagmarella prima Sol. (1; 108; 110; 165; 166; 386; 405; 439).

Age

Age Span:

Beginning stage:

Bashkirian

Fraction up in beginning stage:

0.9

Beginning date (Ma):

315.98

Ending stage:

Moscovian

Fraction up in the ending stage:

0.5

Ending date (Ma):

311.09

Depositional setting

Depositional pattern:

Additional Information

Compiler:

F.R. Beni – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”