Kshikanidyan Formation

Kshikanidyan Fm

Period:

Carboniferous

Age Interval:

Visean, CK3-5, CK6

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Along the Kshikaindy River, Dzhebaglytau Mountains, western part of the Talas Alatau. O.I. Sergunyukova, 1959 (382, p. 64). Stratotype along the Kshikaindy River, a left tributary of the Dzhebagly River. Middle formation in Pskem Gr.

Synonym: Kshikandinskaya Suite, Кшиканидянская св.

Lithology and Thickness

Thin-bedded silicified and clayey limestones with layers of siliceous shales and argillites. Predominantly bryozoan-detrital clayey limestones. Characterized by strong diagenetic silicification of clayey-argillaceous layers, with organic remains (up to 50-70%) as the main component of the rocks, represented by rock-forming bryozoans and crinoids. Thickness: 200-250m.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

Conformably overlies the Irisuy Fm

Upper contact

conformably overlain by the Kibray-Carb Fm (Tkachev et al., 1992f.; 1996f.; 439).

Regional extent

Southwestern spurs of the Talas Alatau, Ugam, Pskem, Sandalash, Koksu, Chatkal Ranges, Karatau, Karzhantau Mountains.

GeoJSON

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Fossils

Contains bryozoans *Batostomella multipora* Nikif., *Fenestella rudis* Ulr., etc.; foraminifers - *Tetrataxis eominima* Raus., *T. paraminima* Viss., *T. quasiconica* Brazhn., *T. vulgaris* Mal., etc. (460); brachiopods - *Dictyoclostus deruptus* Rom., *Spirifer grimessi* Hall., *Verkhotomia plena* Hall.; conodonts - *Gnathodus texanus* Roun., *Paragnathodus symmutatus* (R.A. et D.), *Lochriea homopunctata* (Zieg.)

Age

Fossil data indicates early Visean age.

Age Span:

Beginning stage:

Visean

Fraction up in beginning stage:

0.3

Beginning date (Ma):

341.81

Ending stage:

Visean

Fraction up in the ending stage:

0.5

Ending date (Ma):

338.54

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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