Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

Main source = Baratov, R.B., et al. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Publishing House "Donish", Dushanbe, 269 pp. plus tables. Provided by Dr. Jovid Aminov, Nazarbayev University, Astana, Kazakhstan Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple

Kugitang Formation

Kugitang Fm

Period:

Jurassic

Age Interval:

Callovian – Oxfordian (J₃), C2

Province:
Central W Tajik

Type Locality and Naming

It was allocated in 1959 by P. I. Kalugin. In the Decisions of the Tashkent meeting (Decisions..., 1959) it is called the Gissar suite.

Synonym: Kugitang Suite, кугитангской свитами, Gissar suite

Reference section:

Lithology and Thickness

The section of the Kugitang Fm, from bottom to top: 1 - thick-bedded limestones, thickness 90-105 m; 2 - fine-grained sandstones with interlayers of clays and claystones (45-100 m); 3 - interbedding of limestones, marls, dolomites, clays, and sandstones (15-60 m); 4 - interbedding of clayey limestones, marls, dolomites with lenses of brecciated limestones and limestone breccias (18-65 m). Thickness of the suite 120-145 m.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

It lies conformably on the Baysun Fm of the upper Bathonian-lower Kimmeridgian

Upper contact

It is conformably overlain by the Gaurdak Fm (гаурдакской свитой).

Regional extent

It is widespread in the Dushanbe district. In its western part (to the west of the interfluve of the Shirkent-Luchob) it is represented by the Kugitang Fm (кугитангской свитами). In the interfluve Shirkent--Luchob these several non-coeval suites transition (pairwise) into each other along the strike.

GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[68.73,38.86],[69.27,38.99],[69.86,39.03],[69.87,38.91],[69.76,38.64],[68.9,38.29],[68.7,38.33],[68.51,38.4],[68.22,38.39],[68.29,38.75],[68.73,38.86]]]]}}

Fossils

In the first limestone section of the Kugitang suite, remains of Callovian bivalves (det. N. D. Yushina) Ceratomya callaviensis Kas., Entolium ivanovi Pcel., E. demissum Goldf., Protocardia concinna (Buch.), P. borissjaki Pcel., Inoperna perplicata (Etal.), Aequipecten subinaequicostatus Kas., etc. are collected. In the rest of the section, remains of Oxfordian pelecypods Camptonectes lens Sow., C. kurganchensis Rep., Plesiocyprina gissarensis Rep., Mytilus subpectinatus Orb, Pinna lanceolata Sow., Pteria schundarensis Rep., Astarte carinata Rep., etc. are contained.

Age

Based on these fossil data, the Kugitang Fm is attributed to the Callovian and Oxfordian (Luchnikov, 1972).

Age Span:

Beginning stage:

Callovian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

165.29

Ending stage:

Oxfordian

Fraction up in the ending stage:

1.0

Ending date (Ma):

154.78

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Extracted from Baratov, R. B. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Donish, Dushanbe, 276.