Taushan Formation

Taushan Fm

Period:

Carboniferous

Age Interval:

Moscovian, K9

Province:
Kyzylkum Region

Type Locality and Naming

Along the Taushan River, Kuldjuktau Mountains, Central Kyzylkum. V. A. Zakharovich in 1939 (44, p. 39).

Synonym: Taushan Suite, Таушанская св.

Lithology and Thickness

The section of the suite (total thickness 550m) is divided into two parts.

Upper (thickness 500m) - rhythmically alternating gray, dark gray polymictic sandstones, siltstone (aleurolites) with interlayers of slates and lenses of gravelites, tuffaceous sandstones, tuff-gravelites and effusive rocks of medium and acidic composition.

Lower (thickness 50m) - rhythmically alternating thin-bedded, often banded jasper-like, siliceous rocks of gray, dark gray, bluish-green color and carbonaceous-clayey slates of dark gray, gray color, rarely fine-grained dark gray limestones. To this part of the section are attributed lenticular interlayers of bluish-green, greenish-gray, raspberry tuffaceous sandstones, tuffs, greenish-gray liparitic porphyries and their tuffs.

Lithology Pattern:

Fine-grained sandstone

Relationships and Distribution

Lower contact

The lower boundary is not established.

Upper contact

It is overlain with angular unconformity by the Kamystin Fm. According to V.V. Mikhailov (460), the Taushan Fm transgressively overlies various mountains of Silurian and Devonian formations.

Regional extent

Central Kyzylkum, middle strip, partially north and south slopes of the Kuldjuktau Mountains.

GeoJSON

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Fossils

According to Yu.I. Loskikin et al. (1986), the Taushan Fm represents a typical "wild flysch", or olistostrome of middle-late Carboniferous age, consisting of fine-grained matrix, including fragments and blocks (up to 1-2 km in size) of limestones, calcareous conglomerates with fauna of Devonian; A.K. Bukharin et al. (1990) attribute the suite to olistostromal formations of the Moscovian stage of the middle Carboniferous

Lower –At the base - conglomerates and conglobreccias, a horizon with boulders and blocks of limestones with fauna of Silurian, Devonian, lower Carboniferous.

Upper – Sandstones and slates contain flora - Stigmaria ficoides Sternb., Sublepidodendron ex gr, nordenskioldii Nath., Lepidodendron ex gr. losseni Waiss., Calamites ex gr. cistii Brongn. and others, conditionally early Carboniferous in appearance (44; 195).

Age

The age of the suite is accepted as middle Carboniferous, Moscovian stage. V.A. Zakharovich considered the suite as Silurian, Yu.A. Likhachev et al. (266) attributed it to the upper Ludlow; Ya.B. Aysanov et al. (44; 1984) - to the middle Carboniferous. On the State Geol. Map-500 of Uzbekistan (460) the age is dated as late Moscovian. Put as 50% up in Bashkirian in Lexicon; even if book puts as "late Moscovian"; to adjust for basal (undated) conglomerate

Age Span:

Beginning stage:

Bashkirian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

319.28

Ending stage:

Moscovian

Fraction up in the ending stage:

0.45

Ending date (Ma):

311.49

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Z.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)”