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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Shakarsev Formation

Shakarsev Fm

Period:

Permian

Age Interval:

Wuchiapingian (P₂ p), D1

Province:
SW Tajik

Type Locality and Naming

The Shakarsev Fm was distinguished by V. I. Popov (1933) under the name "gypsum-bearing," the geographical name for it was proposed by G. A. Dutkevich and M. A. Kalmikova (1937).

Synonym: Pamir Horizon, Shakarsevskaya suite, Шакарсевская свита,

Reference section:

Lithology and Thickness

It is composed of gray and green, less frequently brownish, clays and sandstones, containing layers of dark gray limestones and light gray gypsums, as well as lenses of rock salt. Thickness is 400 m.

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

It lies with a clear angular unconformity on the red-colored terrigenous rocks of the Iollihar Fm, attributed to the Murghab horizon, as well as on the eroded surface of small intrusives of diorites and gabbro-diorites of the late Permian Ravnousky complex, piercing the Iollihar Fm. At the base of the Shakarsev Fm, there are angular fragments of diorites, locally diorite gravel (Vlasov, 1961).

Upper contact

It is apparently overlain in conformity by the Chapsay Fm.

Regional extent

They are widespread in the Darvaz region within the Southwestern Darvaz.

GeoJSON

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Fossils

Organic remains in the Shakarsev Fm have not been found, except for collected (?) remains of Permian brachiopods. It is conditionally attributed to the Pamir horizon based on its position in the section.

Age

V. I. Popov (1933) considered the suite under consideration to be conditionally Lower Permian. G. A. Dutkevich and M. A. Kalmikova (1937), and later M. A. Kalmikova (1959) believed that it is transitional from the Lower to Upper Permian based on the assumption of the affiliation of separate outcrops or blocks of "brachiopod-bryozoan" limestones with Lower Permian Misellina claudiae Depr. and Upper Permian Polydiexodina darvasica Dutk. These assumptions were not confirmed. The limestones with Lower Permian fusulinids turned out to be related to the Gundarinskaya suite of the Kuberghandinsky horizon, and the polidiexodines were found in blocks originating from conglomerates of the Neogene. The affiliation of these blocks to any of the suites of the Permian of Darvaz has not yet been established (Vlasov, 1961; Vlasov, Likharev and Miklukho-Maklay, 1962).

Age Span:

Beginning stage:

Wuchiapingian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

259.55

Ending stage:

Wuchiapingian

Fraction up in the ending stage:

1.0

Ending date (Ma):

254.24

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.