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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Chechektin Formation

Chechektin Fm

Period:

Neogene

Age Interval:

Pliocene (N2? ck), E-Psh1

Province:
East Tajik (East Pamir)

Type Locality and Naming

Includes in East Pshart. It was distinguished by D.V. Nalivkin et al. (1932). The formation is named after the village of Chechekty

Synonym: Chechektinskaya Suite, Чечектинская свита

Reference section:

Lithology and Thickness

It is composed of dense gray conglomerates and sandstones with rare interlayers of greenstone volcanics. The incomplete thickness is 1500 m. The lower package (5-100 m) is composed of dense and loose polygravel conglomerates, sometimes boulder. The composition of the pebbles of the conglomerates entirely depends on the underlying sediments. The middle package (100-300 m) - quartz and quartz-feldspar limestone sandstones with interlayers and lenses of limestones and limestone conglomerates. The upper (500-1000 m) - gray and dirty lilac-red poly-gravel, including boulder conglomerates with layers, packages, and lenses of various sandstones, gravelites, and greenstone-altered intermediate basic volcanics.

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

It lies with an angular unconformity on all older sediments.

Upper contact

It is overlain with an angular unconformity by Quaternary formations.

Regional extent

It is widespread in the Central Pamir near the village of Chechekty.

GeoJSON

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Fossils

V.I. Dronov found in the pebbles of limestones in this suite remains of Upper Cretaceous rudists, and I.A. Gusev (1972) - spores and pollen of the Neogene.

Age

At the same time, the Chechektin Fm sharply differs in the composition and color of the rocks from the directly adjacent to the south red-colored rocks of the Paleogene? Buguchin Fm and Miocene? Yemantash-Tashkalyak Fms (яманташской-ташкалякской свит). Based on these data, the Chechektin Fm is conditionally referred to the Pliocene. It should be emphasized that the ideas about the age of the Chechektin Fm have changed repeatedly. D.V. NalVekin et al. (1932) considered it to be of the Jurassic period, G. A. Dutkevich (1935) - of the Middle Paleozoic, M. S. Dufour (1958) - of the Ordovician, B. K. Kushlin (1959) - of the Triassic, I. A. Gusev (1972) - of the Neogene. We have adopted the latter point of view, but it should be noted that I. A. Gusev does not distinguish the Chechektin Fm and considers the conglomerates attributed to it as belonging to the Yamantash-Tashkalyak Fms (яманташскоиташкалякскои).

Age Span:

Beginning stage:

Zanclean

Fraction up in beginning stage:

0.0

Beginning date (Ma):

5.34

Ending stage:

Piacenzian

Fraction up in the ending stage:

1.0

Ending date (Ma):

2.58

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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