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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Vamar Formation

Vamar Fm

Period:

Triassic, Jurassic

Age Interval:

Rhaetian-Bajocian (T₃- J₂ vm), R1

Province:
SE Tajik (SE Pamir)

Type Locality and Naming

The suite was identified by I. G. Baranov in 1935. In many preceding works, the described suite was considered under the name "Kokuybelskaya", which is incorrect, since it was first called "Vamarskaya".

Synonym: Vamarskaya suite, Вамарская свита, Kokuybelskaya

Reference section:

Lithology and Thickness

The suite is composed of dark, a-rhythmic alternating polymictic and quartz-feldspar sandstones, claystones, clayey and carbonaceous shales. Thickness is 1500 to 2000 m.

Lithology Pattern:

Sandy_claystone

Relationships and Distribution

Lower contact

In most outcrops, the underlying deposits are unknown; in the eastern part of the Yazgulemsky Ridge and at the northwestern end of the Muzkol Ridge, it lies above light marble-like limestones and marbles of conditionally Permian-Middle Triassic age (Khavrezdaryn Fm (хаврездаринская толща). The nature of their contact is not clarified, possibly tectonic.

Upper contact

The suite is overlain conformably by gray marbles and marble-like limestones of conditionally Middle-Late Jurassic age (Shishar Fm (шишарбская свита) in the basin of the Vamardara River).

Regional extent

It is widespread in the western part of the Central Pamir, in the basins of the Bartang and Panj rivers.

GeoJSON

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Fossils

Organic remains in the suite are represented by Late Triassic-Jurassic terrestrial plants: Pterophyllum aequale (Br.) Nath., P. andreanum Schimp., Nilssonia rajmahalensis Sew. et Sahni, Equisetites aff. arenaceus (Jaeg), Glathropteris meniscoides Brongn., Ctenopteris cycadea (Brongn.), Czekanowskia rigida Heer, Cladophlebis cf. raziborski Leil. Presumably, in the upper part of the suite on the Pish pass (between the basins of the Riddara and Barhuv rivers), marine Middle Jurassic pelecypods were encountered - Pholadomya ci. decorata Hart., Ph. cf. wittlingeri Waag., Trigonia cf. ziet Presumably coeval and co-facial deposits with the Vamar suite in the Southwestern Pamir are dark metamorphosed sandstones and shales, the outcrops of which are known in the area of the Namangut village. In 1946, N. A. Khorev found remains of terrestrial flora - Juccites sp. The contact of these with the metamorphic rocks of the Southwestern Pamir is tectonic.

Age

Rhaetian-Bajocian

Age Span:

Beginning stage:

Rhaetian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

205.74

Ending stage:

Bajocian

Fraction up in the ending stage:

1.0

Ending date (Ma):

168.17

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.