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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Nadak Formation

Nadak Fm

Period:

Carboniferous

Age Interval:

Middle Carboniferous (C2-3 nd), S1

Province:
North Tajik

Type Locality and Naming

It was identified by Z.P. Artemova in 1956.

Synonym: Nadakskaya suite, Надакская свита

Reference section:

Lithology and Thickness

The composite section of the Nadakskaya suite (надакской свиты) looks as follows (bottom to top):

1 - conglomerates, arkosic and graywacke sandstones and siltstones, sometimes containing lenses and layers of clayey slates and black bituminous limestones, less often tuffs and tuff sandstones, thickness 50-350 m (Kuhidarozhskaya thickness);

2 - dark gray, greenish-gray, less often brown and purple agglomerate lavas, clastolavas and tuffs of quartz latites, thickness 200-650 m (Chalysaishskaya, Suyuguchakskaya thicknesses) ;

3 - pink and reddish-gray blasto-lavas of liparites, thickness 500 - 1100 m (Almalysskaya, Shaidanskaya thicknesses);

4 –light gray or greenish-gray andesite-dacites and their crystal tuffs with tuff sandstones at the base, thickness 600 m (Karataushcha Suite)( караташская толща).

The Karataushcha Suite is completely eroded in the Lashkeretskaya and partially in the Adrasmanian basins. (Адрасманской мульдах.)

Lithology Pattern:

Lava

Relationships and Distribution

Lower contact

It lies with deep erosion on all older rocks, including on the granitoids of the middle Carboniferous Karamazar complex and on the middle Carboniferous Akchin Fm (акчинакой свите).

Upper contact

It is overlain with erosion by the volcanics of the upper Carboniferous Oyasa Fm (оясайской свиты).

Regional extent

It is distributed in the Karamazar district, where it is the second from the bottom suite of the Upper Paleozoic - Triassic volcanic series (see Akchinskaya suite) (акчинскую свиту).

GeoJSON

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Fossils

At the base of the Nadakskaya Suite in the Lashkeretskaya and Adrasmanian basins, S.M. Babakhodzhaev, V.F. Bazil, Yu.M. Kuzichkina collected remains of the flora Neuropterus heterophyllun! Brongn., Calamites undulatus Sternb., and others in 1961-1962. According to determinations by T.A. Sixtel, they are known from both the middle and upper Carbon. Palynological studies have shown the presence in the lower layers of the suite of Leiotriletes vetustus Isch., L. inermus (Walt.), Aconthotriletes optus Isch., found in Bashkirian and Moscovian deposits.

Age

These few paleontological data and the middle Carboniferous age of older formations give grounds to consider the Nadakskaya Suite (основание считать) as middle Carboniferous in its lower part and possibly upper Carboniferous in its upper part.

Age Span:

Beginning stage:

Serpukhovian

Fraction up in beginning stage:

0.95

Beginning date (Ma):

323.75

Ending stage:

Bashkirian

Fraction up in the ending stage:

0.6

Ending date (Ma):

318.45

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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