Neogene

Paleogene

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

Mesoproterozoic

Paleoproterozoic

Main source = Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian) Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

Shurchin Formation

Shurchin Fm

Period:

Ordovician

Age Interval:

Tremadocian, N8

Province:
Nuratau

Type Locality and Naming

By the village of Shurchi, South Nuratau range. Y.I. Loskin et al. in 1964 (1965), I.A. Pyanova et al., 1986 (371, pp. 2123). Which the term is not recommended for use.

Synonym: Shurchinskaya Suite, Шурчинская св.

Lithology and Thickness

Alternation of slates and limestones, often with lenses and interlayers of black siliceous rocks, dolomitic siltstone (aleurolites), and carbonate sandstones. Thickness 100-300 m.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

Tectonic contacts.

Upper contact

Tectonic contacts.

Regional extent

From Gobduntau in the east to Mt. Kokcha in the west (stretching in the form of narrow tectonic scales). According to data by R.S. Khan (1989), V.S. Korsakov et al. (1993), previous researchers included deposits of the Kalsarin Fm and Badamchali Fm in the composition of the Shurchin Fm

GeoJSON

null

Fossils

Contains hyoliths - Quadratotheca? sp., Hypolithellus sp., Cireotheca sp.; brachiopods - Linguella sp.; sponges - Chanceloria sp.; cyanobacteria - Stereophycus schochycus Pjan.

Age

Initially, the suite was conditionally referred to the Ludlow (Loskin et al., 1965), then to the Upper Cambrian(?) Lower Ordovician (271; 280). Arbitrary base as Tremadocian, as the age needs clarity.

Age Span:

Beginning stage:

Tremadocian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

486.85

Ending stage:

Tremadocian

Fraction up in the ending stage:

1.0

Ending date (Ma):

477.08

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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