Syuget Formation

Syuget Fm

Period:

Silurian

Age Interval:

Lower Silurian (Llandovery-lower Wenlock), F10b

Province:
Fergana

Type Locality and Naming

Along the village of Syuget, Alai ridge. G.S. Porshnyakov, A.D. Miklouho-Maclay in 1955 (356, p.22; 441, p.416). Stratotype near the village of Suyget.

Synonym: Syugetskaya Formation, Сюгетская св.

Lithology and Thickness

Clayey, carbonaceous-clayey shales and siltstone (aleurolites) with interlayers and lenses of siliceous shales, sandstones, limestones. Basalt flows, their tuffs, diabases are noted. Thickness 300-400m and more.

Lithology Pattern:

Sandy_claystone

Relationships and Distribution

Lower contact

The lower boundary is unknown

Upper contact

It is overlain conformably by the Pulgon Fm

Regional extent

Karachatyr Mountains, northern foothills of the Alai Range. In the territory of Uzbekistan, they are observed as small outcrops in South Fergana (Turkestan-Alai Mountain Region).

GeoJSON

null

Fossils

Graptolites indicate early, rarely middle and late Llandovery early Wenlock - Akidograptus ascensus Davies., Climacograptus scalaris ferganensis Obut., C. scalaris normalis Lapw., C. medius Törnq., Paraclimacograptus sinitzini (Chal.), Spirograptus turriculatus (Barr.), Monoclimacis griestonensis (Nicol.), M. asiatica Obut., Oktavites spiralis (Gein.), Monograptus priodon (Bronn.), M. riccartonensis Lapw., Cyrtograptus murchisoni Carr. and others (165; 441; 460).

Age

Graptolites indicate early, rarely middle and late Llandovery-early Wenlock

Age Span:

Beginning stage:

Telychian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

438.59

Ending stage:

Sheinwoodian

Fraction up in the ending stage:

0.2

Ending date (Ma):

432.47

Depositional setting

Depositional pattern:

Additional Information

Compiler:

– In: GeoGPT translation of: ”Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)"