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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Syuget Formation

Syuget Fm

Period:

Silurian

Age Interval:

lower-upper Llandovery (S₁ sg), S3, S5

Province:
North Tajik

Type Locality and Naming

It was distinguished by G. S. Porshnyakov and A. D. Miklukho-Maklai (1955). D. A. Starshinin in 1971 described these deposits under the name of the Sharsharinskaya suite.

Synonym: Syugetskaya suite, Сюгетская свита, Sharsharinskaya suite

Reference section:

Lithology and Thickness

Everywhere in the Syuget Fm, dark gray carbonaceous, clayey, and siliceous slates predominate, alternating with sandstones and claystones. In subordinate quantities, there are interlayers and lenses of limestones, diabases, porphyrites, their tuffs, gravelites, conglomerates, and cherts. The incomplete thickness of the Syugetskaya suite southwest of the city of Uratyube reaches 1400 m.

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

The base of the suite is unknown.

Upper contact

it is conformably overlain by sandstone-slate rocks of the Pulkhon Fm, belonging to the Wenlock-Ludlow stages.

Regional extent

Within the described area, it is distributed southwest of the city of Uratyube and north of the Kuh mountains. The Syuget Fm is also exposed along both banks of the river Isfara.

GeoJSON

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Fossils

The lower horizons of the Syugetskaya suite contain remains of graptolites of the lower and middle Llandovery Demirastrites cf. triangulatus (Harkn.), Climacograptus medius Tornq., Pristiograptus sandersoni (Lapw.), Glyptograptus persculptus Salt., Dimorphograptus swanstoni Lapw., Cystograptus vesiculosus Nich. and others. In the rest of the suite, numerous remains of Upper Llandovery graptolites Spirograptus turriculatus Barr., Sp. minor Boucek, Oktavites spiralis (Gein.), Retiolites angustidens (Elles), Monograptus pandus Lapw. and others are found. There are also individual finds of remains of Upper Llandovery tabulate corals Mesoiavosites verus Lel., Paleofavosites forbesiformis Sok., Heliolites ex gr. decipiens Mc Coy and others.

Age

Thus, the observable part of the Syugetskaya suite corresponds to the lower, middle, and upper Llandovery.

Age Span:

Beginning stage:

Rhuddanian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

443.07

Ending stage:

Telychian

Fraction up in the ending stage:

1.0

Ending date (Ma):

432.93

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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