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

Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple

Kyzykin Formation

Kyzykin Fm

Period:

Devonian

Age Interval:

Pragian (D₁ kz), S2

Province:
North Tajik

Type Locality and Naming

Synonym: Kyzykinskaya suite (Кызокинская свита)

Lithology and Thickness

Dolomitic limestone. It is represented by gray layered limestones and dolomites, containing rare layers and packages of marl, as well as gray and greenish clayey and calcareous shales, siltstones (=silty like), gravelites, and cherts. The thickness of the suite is 300-600 m.

Lithology Pattern:

Dolomitic limestone

Relationships and Distribution

Lower contact

It lies (according to D.A. Starshinina - conformably, and according to M. M. Posokhova - with angular unconformity) on the rocks of the Zaamin Fm.

Upper contact

The Kyzykin Fm is overlain discordantly by the Arpapaya Fm, арпапаятской свиты.

Regional extent

It is widespread in the Turkestan district in the interfluve of the Altikol-Dakatsu.

GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[68.81,39.88],[69.03,39.9],[69.45,39.98],[71.41,41.03],[71.78,41.31],[73.02,40.87],[71.84,39.88],[70.94,39.83],[70.1,39.66],[68.92,39.51],[68.44,39.58],[68.41,39.72],[68.54,39.89],[68.81,39.88]]]]}}

Fossils

The deposits of the Kyzokinskaya suite (кызокинской свиты) are characterized by a large complex of organic remains, allowing it to be attributed to the upper part of the Lower Devonian: Favosites brusnitzini Peetz., F. aff. tachlovitzensis Pocta, F. goldfussi d'Orb., F. alpina Horn., Aulacophyllum ex gr. sulcatum d'Orb. Clorinda pseudolinguifera Kozl: Stegerhynchus cf. pseudolivonicus (Barr.), Cymostroghia cf. stephani (Barr.), Carinatina arimaspa Eichw., Pugnax julii Gortani, Uncinulus cf. kekelikensis Nal., Turkestanella acuaria Klish., Styliolina subcylindrica Klish, etc. It should be noted that, along with the named species, the fossil complex of the Kyzokinskaya suite includes forms usually characteristic of both older and younger deposits. To clarify the age of the suite, its study must be continued.

The gray laminated limestones, dolomites, and marls exposed in the upper reaches of the Rasraut, along with sandstone beds, clayey and limestone shales, conformably lying on the terrigenous deposits attributed to the Zaamin suite, and conformably overlain by the dolomitic limestone massif of the Pragian-Eifelian age, should, apparently, be attributed to the Kyzokinskaya suite. The thickness of these deposits is 480 m. They are mainly characterized by remains of the Manak horizon tabulate corals (Pragian stage) Favosites clarus Yanet., F. lazutkini Tchern., F. sibiricus Peetz, Cladipora rectilineata Simps., and brachiopods typical of this stage, Spirigerina cf. supramarginalis Khalf., Gypidula cf. acutolobata Sand., G. cf. hreviplicata A. Volcova.

In this same massif, forms characteristic of the Kungurian horizon are encountered: Gypidula cf. pelagica Barr., Delthyris ex gr. tiro Barr., Camarotoechia famula Barr., Favosites hisingeri E. et H., F. ex gr. forbesi E. et H., Squameofavosites aff. thetidis Chekh., etc.

Age

Thus, judging by the above materials and taking into account the presence of Pragian stage fauna in the underlying and overlying deposits, it appears that the time of accumulation of the Kyzokinskaya suite deposits does not extend beyond the Pragian epoch.

Age Span:

Beginning stage:

Pragian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

412.40

Ending stage:

Pragian

Fraction up in the ending stage:

1.0

Ending date (Ma):

410.51

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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