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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Ayudzhilgin Formation

Ayudzhilgin Fm

Period:

Carboniferous

Age Interval:

Serpukhovian (C₁ ad), C3

Province:
Central Tajik

Type Locality and Naming

It was first separated in 1964 by K. F. Stazhilo-Aleksandrov and E. S. Chernykh from the composition of the "Belayulinskaya limestone suite" (е.леуJiинской известняковой свиты) of M. I. Shabal'kina (1937); it was named "Ayudzhilginskaya" (аюджилгинс-кой") by N. G. Vlasov and G. V. Gnilovskiy (1967).

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: Ayudzhilginskaya suite, Аюджилгинская свита, Belayulinskaya limestone suite, е.леуJiинской известняковой свиты

Reference section:

Lithology and Thickness

It is composed of dark gray and light limestones up to 800 m thick. At the base of the Ayudzhilgin Fm (аюджилгинсксй свиты), there is an unsteady horizon (0-150 m) of tuff sandstones, tuff gravels, liparite porphirites, possibly formed partly due to the destruction of the Saukisay Gr volcanics.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

The suite lies in places sharply unconformably (Belayuli River, Fedchenko Glacier), and in most cases without visible unconformity on the Tournaisian-Visean formations of the Saukisay Gr.

Upper contact

Transgressively, but without angular unconformity, overlies the Permian Pshikharv Fm (пшихарвской свитой).

Regional extent

It is widely distributed in the Muxsuiskiy, Lakhsh district.

GeoJSON

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Fossils

In the tops of the Ayudzhilgin Fm in the valleys of the Belayuli, Ayudzhilga rivers and on the Borbash Glacier, early Namurian Goniatites Cрavenoceras aff. hesperium Mill. et Furn., Ср. sp. were found by M. I. Shabal'kina and R. N. Sham'sudinov.

Age

Age Span:

Beginning stage:

Serpukhovian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

330.34

Ending stage:

Serpukhovian

Fraction up in the ending stage:

1.0

Ending date (Ma):

323.40

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.