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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Varsidz Formation

Varsidz Fm

Period:

Jurassic

Age Interval:

Middle - Upper Jurassic (J2? vr), Sh1

Province:
SE Tajik (SW Pamir)

Type Locality and Naming

Includes in Shadarlan and Schugnan ranges. It was distinguished in 1968 by V.P. Bulin and G.V. Kuznetsov.

Synonym: Varsidzskaya suite, Варшидзская свитa

Reference section:

Lithology and Thickness

It is composed of interbedded black brecciated limestones, clay shales, sandstones, and claystones. The incomplete thickness is 200 m.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

The contacts with older rocks are tectonic

Upper contact

It is overlain by the suite (according to V.P.T. Bulin and G.V. Kuznetsov - unconformably, and according to B.P. Barhatov - without apparent angular unconformity) by boulder breccial conglomerates of the Upper Pliocene - Lower Quaternary Bahmaljilgin Gr.

Regional extent

It is found in the Southwest Pamir on small areas in the interfluve of the Varsidzdar-Duzakhdar and in the valley of the Yulmazar River.

GeoJSON

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Fossils

S.I. Klunnikov et al. (1936), B.P. Barhatov (1963), V.P. Bulin and G.V. Kuznetsov collected in the Varsidz Fm remains of bivalves, corals, and brachiopods, which have poor preservation.

Age

The fossil data do not define the age of the rocks more accurately than Jurassic. This suite is conditionally attributed to the Middle Jurassic, based on some similarity to the Middle Jurassic formations of the Southeastern Pamir. B.P. Barhatov (1963) considered them conditionally Middle to Upper Jurassic.

Age Span:

Beginning stage:

Callovian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

165.29

Ending stage:

Oxfordian

Fraction up in the ending stage:

0.2

Ending date (Ma):

160.18

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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