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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Khushikat Formation

Khushikat Fm

Period:

Silurian

Age Interval:

Upper Llandovery (S₁ ln₃), S4

Province:
North Tajik

Type Locality and Naming

This suite was distinguished by M. M. Posokhova in 1959.

Synonym: Upper subseries, Khushikatskaya suite, хушикатская свита, Pasdonskaya suite Хушикатская свита, Lyangarskaya and Kshatdakskaya, лянгарскую и кштудакскую (in the Zeravshan valley, divided by A.S. Shadchinev (1970)

Reference section:

Lithology and Thickness

A. S. Shadchinev (1970) refers to it as the Pasdon Fm (Хушикатская свита) is composed of gray, thick-bedded feldspathic-quartz sandstones containing interlayers of carbonaceous-clayey slates, rarely diabases, porphyrites, their tuffs, and lava breccias. The thickness of the suite is 400-1700 m.

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

It conformably overlies on the Baikunghur Fm, байкунгурской свите of the lower + middle Llandovery

Upper contact

It is conformably overlain by the Garibak Fm, свитой венлокскоrо of the Wenlock-Ludlow stages

Regional extent

It is widespread in the Turkestan region. In its southern part, on the southern slopes of the Turkestan range.

GeoJSON

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Fossils

The deposits are characterized by remains of Upper Llandovery graptolites Pseudoplegmatograptus obesus Lapw., Petalolithus ovatus Barr., Rastrites fugax Barr., Spirograptus minor Boucek, Monograptus priodon Bronn., Monoclimacis griestoniensis Nicol., Pristiograptus nudus Lapw., Stomatograptus grandis Suess, Oktavites spiralis Geinitz. Deposits corresponding to the upper graptolite zone of the Llandovery stage Stomatograptus grandis - A. C. Shadchinev (1970) did not include in the considered suite. According to D. A. Starshinin, they are referred to it.

Age

characterized by remains of Upper Llandovery

Age Span:

Beginning stage:

Telychian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

438.59

Ending stage:

Telychian

Fraction up in the ending stage:

1.0

Ending date (Ma):

432.93

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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