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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Altykol Formation

Altykol Fm

Period:

Cambrian

Age Interval:

Lower Cambrian (Є1), S2

Province:
North Tajik

Type Locality and Naming

Synonym: Altykol suite, алтыкольская свита

Reference section:

Lithology and Thickness

Composed of dark gray clay-carbonaceous and siliceous slates containing interlayers of feldspar-quartz sandstones and limestones. The incomplete thickness of the Altykol suite is 2000 m.

Lithology Pattern:

Gypsiferous claystone

Relationships and Distribution

Lower contact

The underlying deposits are unknown.

Upper contact

It is overlain transgressively, but without angular discordance, by terrigenous rocks of the Mayan stage Fm of the Middle Cambrian.

Regional extent

They are widespread in the Turkestan region, identified by B.V. Yaskovich (Geol. USSR, vol. 23, 1972).

GeoJSON

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Fossils

The Aldansky stage is characterized by a complex of archaeocyaths: Protopharetra aff. polymorpha Born., Archaeocyathus cf. vologdini Bedf., A. (Spirocyathus) latus Vol., Coscinocyathus aff. rojkovi Vol., C. aff. taylori Vol., C. ex. gr. elegans Vol., C. ex gr. dianthus Born.

The upper part of the described rocks contains remains of trilobites characteristic of the Lensky stage, Lermontovia schachristanica Hajr., L. turkestanica Suv., Redlichia uzbekistanica Hajr., Jangudaspis kumbeli Hajr., Alticolia posochovae Hajr., Peronopsis eoscutalis Hajr., Protolensis drevanovskii Tchern., etc. (Geol. USSR, vol. 23, 1972).

Age

For schematic stratigraphic column representation, considered Lower Cambrian as it is overlain transgressively, but without angular discordance, by terrigenous rocks of the Mayan stage Fm of the Middle Cambrian.

Age Span:

Beginning stage:

Fortunian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

538.80

Ending stage:

Wuliuan

Fraction up in the ending stage:

1.0

Ending date (Ma):

504.50

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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