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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Gumbezkol Formation

Gumbezkol Fm

Period:

Triassic

Age Interval:

Ladinian-Carnian (T_2-3), E-Psh3

Province:
East Tajik (East Pamir)

Type Locality and Naming

Includes in East Pshart (Agadjan river basin)

Synonym: Gumbazkol formation, Гумбезкольская толща

Reference section:

Lithology and Thickness

It consists of greenstone-altered coarse- and giant-bedded, slate-like in the lower part, dark and light green basic volcanic rocks: diabases, picritic porphyrites, spilites, anamisites. (400-1000 m). In the lower part of the formation, the volcanics include lenses and discontinuous beds of limestones.

Lithology Pattern:

Volcanic_ash

Relationships and Distribution

Lower contact

It lies in an unclear contact with the nominally Lower-Middle Triassic Agadzhan Fm (агаджанской толще)

Upper contact

Overlying deposits are absent.

Regional extent

It is developed in the axial part of the eastern half of the Pshart Range, in the estuarine part of the Kalaktash locality, and in the upper reaches of the Agadjan river basin.

GeoJSON

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Fossils

In the lower part of the formation, the volcanics include lenses and discontinuous beds of limestones, from which remains of Ladinian-Carnian corals have been collected: Craspedophyllia alpina (Loretz), Margarosmilia septanectens (Loretz), Margarophyllia sp., Prothoheterastraea leonardi (Volz), Margarosmilia cf. confluens (Münst.), Thecosmilia? ex gr. sublaevis (Münst.), Triadophyllum sp.

Age

Ladinian-Carnian

Age Span:

Beginning stage:

Ladinian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

241.46

Ending stage:

Carnian

Fraction up in the ending stage:

1.0

Ending date (Ma):

227.30

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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