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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Pustan Formation

Pustan Fm

Period:

Jurassic

Age Interval:

Oxfordian (J₃), Sar2

Province:
East Tajik (easternmost Pamir)

Type Locality and Naming

Includes in Sarykoln district (Istyk type section (Kokchagin area)

Synonym: Pustanskaya Suite, пустанская Свита

Reference section:

Lithology and Thickness

The uppermost suite in Kokchaginsky area, is composed of gray variable-bedded clayey limestones, interbedded with claystones and marls. Its thickness is (150 m). The total thickness of the Upper Jurassic deposits here is 860 - 980 m.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

Schematic stratigraphic column indicates the lower contact as Jerkapchal Fm

Upper contact

Schematic stratigraphic column indicates this as the upper contact in the Kokchaginsky area

Regional extent

In the Kokchaginsky area, in the basin of the rivers Zhilgakochusu (Kokchagi), Khan-Yuly.

GeoJSON

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Fossils

It consists remains of Oxfordian fauna: ammonites Perisphinctes cf. wartae Buck., P. cf. orientalis Siem.; pteriomorphs Pteria gessneri Thurm., Lopha solitaria Sow., Modiolus tulipaeus Lam., Falcilytilus ungulatus J. et B. Higher Jurassic layers are absent in the basin of the rivers Dzhilgakochusu (Kokchagi) - Khanyulya.

Age

Oxfordian

Age Span:

Beginning stage:

Oxfordian

Fraction up in beginning stage:

0.6

Beginning date (Ma):

157.48

Ending stage:

Oxfordian

Fraction up in the ending stage:

1.0

Ending date (Ma):

154.78

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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