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

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Kurgovat Formation

Kurgovat Fm

Period:

Carboniferous

Age Interval:

Moscovian - upper Carboniferous (C_2-3? kг), C3

Province:
Central Tajik

Type Locality and Naming

It was distinguished in 1959 by Yu. A. Sorokin, most thoroughly described in 1968 by N. G. Mashталer, and then by N. G. Vlasov and G. V. Gnilovsky (1970). Lakhsh (formerly Jirgatol) District — officially renamed in 2016 — is located in northeast Tajikistan, and includes the village of Mugh (formerly Muk) within its administrative jamoat Lakhshi Bolo (Wikipedia, 2025; RFE/RL via Asia-Plus, 2016; Wikipedia: Mugh; Wikipedia: Lakhshi Bolo).

Synonym:

Reference section:

Lithology and Thickness

It consists of layered ashy-gray or black limestones with a thickness from several meters to 300 m. At their base, there is almost everywhere a package of yellow and white limestones with a thickness of 5-20 m. Occasionally, basal conglomerates with a thickness of 5-10 m are present, in which the fragments of underlying crystalline slates of the Borschit Gr of the lower? Proterozoic or early Proterozoic granitoids of the Kurgovatsky Gr reach sizes of 10-15 cm, and sometimes 100.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

The Kurgovat Fm (Курговатская свита) is locally laid with a sharp angular unconformity on various formations: from gneisses of the lower Proterozoic Borschit Gr to greenstone effusive-detrital rocks of the Tournaisian and Visean (Fortambek Fm) (фортамбекская свита). Without angular unconformity, but with erosion, it is sometimes underlain by limestones of the Namurian? Ayudzhilgin Fm (аюджилrинской свиты). There is an opinion (Geol. USSR, vol. 24, 1959; Chedia, 1956), to which E. S. Chernyer and V. I. Budanov (1974) adhered, about the tectonic, thrust nature of the contact of the Kurgovat Fm with the underlying formations.

Upper contact

The Kurgovat Fm (курговатской свиты) is covered in accordance with and with mutual facies replacements, reaching half of its thickness and more, by sandstones and shales of the Permian Psikharv Fm (пшихарвской свиты).

Regional extent

It is widespread in the Mukhsuisky(Muxuy), Lakhsh district.

GeoJSON

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Fossils

In the Kurgovat Fm, A. Kh. Kafarsky, I. V. Pyzyanov, and N. G. Mashtalerom collected remains of crinoids of a wide age interval from the upper Visean to the middle Carboniferous inclusive. Yu. A. Sorokin, as well as N. G. Vlasov and G. V. Gnilovsky found remains of lilies Moskovicrinus sp. and Hydriocrinus aff. pussilus Trd., unknown according to R. S. Yeltysheva and G. A. Stukalina, below the Moscovian bed (Vlasov and Gnilovsky, 1970).

Age

Moscovian - upper Carboniferous. Based on this conclusion, the indicated relationships with older deposits, as well as the conformable occurrence under the Permian formations, the Kurgovat Fm is conditionally attributed to the Moscovian bed of the middle Carboniferous and to the Upper Carboniferous. The uncertainty of the age of the upper part of the Kurgovat Fm is due to the ambiguity of the age position of the boundary between it and the Psikharv Fm (see above). The lower parts of the Kurgovat Fm, judging by the correlations of sections, most likely correspond to the limestones of the upper Moscow sub-bed of the Darvaz district.

Age Span:

Beginning stage:

Moscovian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

315.15

Ending stage:

Gzhelian

Fraction up in the ending stage:

1.0

Ending date (Ma):

298.89

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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