Sogul Formation

Sogul Fm

Period:

Jurassic

Age Interval:

Lower Jurassic (Pleisbanchian-Toarcian), F9a

Province:
Fergana

Type Locality and Naming

Along the Sogul River, Southern Fergana. V.V. Kurbatov, E.A. Repman et al., 1971 (254, p. 26). Stratotype Along the Sogul level, S. Fergana.

Synonym: Sogulskaya Formation, Согульская св.

Lithology and Thickness

Conglomerates, gravels, sandstones, siltstones with interlayers of clays and coals. Thickness 230-300m.

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

Lies transgressively on the Paleozoic or upper Kamyshbashin Fm

Upper contact

Conformably overlain by the Samarkandek Fm

Regional extent

Coal mines Shurab, Sulyukta, Lyakan, etc. (S. Fergana). Previously described deposits were included in the Sulyuktin Fm. (165; 339; 367; 382, table 13; 383, table 5, p.2; 446).

GeoJSON

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Fossils

Contains large plant remains - Dictyophyllum nilssoni Brongn., Phlebopteris polypodioides Brongn., etc.; freshwater mollusks - Sibireconcha schabarowi Tschern., Subcardinia triangularis Kol.

Age

Lower Jurassic. For schematic stratigraphic representation it is adjusted in Pliensbachian-Toarcian.

Age Span:

Beginning stage:

Pliensbachian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

192.90

Ending stage:

Toarcian

Fraction up in the ending stage:

1.0

Ending date (Ma):

174.70

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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