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

Muzdubulak Formation

Muzdubulak Fm

Period:

Triassic

Age Interval:

Ladinian-Carnian (T_2-3), E-Psh2

Province:
East Tajik (East Pamir)

Type Locality and Naming

Includes in East Pshart (southern slope)

Synonym: Muzdubulak layer (Муэдубулакская толща)

Reference section:

Lithology and Thickness

The layer is composed of gray and dirty-green sandstones, gravels, and conglomerates with beds and packets of various limestones, argillaceous siliceous shales, and greenstone-altered volcanic rocks of basic composition. The terrigenous rocks of the layer are interesting. As a fragmental fraction, they include plagio-granites, plagio-granite-porphyries, writing plagio-granites, albitephires, albite porphyries, quartz porphyries, strongly altered basic effusives, quartzites, sandstones, shales, limestones, cherts, etc. (90-400 m).

Lithology Pattern:

Sandy limestone

Relationships and Distribution

Lower contact

It lies conformably on the tentatively Lower-Middle Triassic Nychkedyilgin Fm

Upper contact

It is overlain with erosion but without angular discordances by the Lower Jurassic Jerunsay Fm of the Madian type

Regional extent

It is exposed on the southern slope of the Pshart Range, in the basin of the Nychkedjilga and Muzdubulak rivers.

GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[73.59,38.21],[73.64,38.23],[73.7,38.23],[73.79,38.26],[73.87,38.28],[73.94,38.27],[74.07,38.25],[74.11,38.25],[74.2,38.23],[74.22,38.24],[74.29,38.23],[74.35,38.19],[74.33,38.19],[74.25,38.21],[74.03,38.2],[73.93,38.19],[73.83,38.18],[73.81,38.19],[73.77,38.18],[73.73,38.18],[73.72,38.19],[73.59,38.21]]]]}}

Fossils

Organic remains are found both in the limestone beds and in the terrigenous rocks of the layer, and are represented by Carnian corals: Conophyllia gracilis (Münst.), C. boletiformis (Münst.), Craspedophyllia cf. alpina (Loretz).

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.