Bassay Formation

Bassay Fm

Period:

Carboniferous

Age Interval:

Middle Carboniferous, K4

Province:
Kyzylkum Region

Type Locality and Naming

Along the Bassay River, Takhatau Mountains, Central Kyzylkum, 3. S. Rumyantseva, 1974 (386, p. 34).

Synonym: Bassaysaya Suite, Бассайская св.

Lithology and Thickness

Based on lithological composition, two parts of the section are distinguished.

Upper (Thickness: 380m) - red-brown conglomerates, coarse-bedded, poorly sorted, dense, with numerous lens-shaped layers of gravelites and uneven-grained sandstones.

Lower (Thickness: 320m) - greenish-gray sandstones and gravelites, conglomerates with occasional layers of reddish-brown siltstones and siltstone (aleurolites). Total thickness of the suite: 700m.

Lithology Pattern:

Aus conglomerate

Relationships and Distribution

Lower contact

Conformably overlies the Dzheltumsuk Fm

Upper contact

It is overlain by modern aeolian sands (439).

Regional extent

Central Kyzylkum, northern slope of the Takhatau Mountains. Corresponds to the upper sub-suite of the Takhatau Fm

GeoJSON

null

Fossils

Organic remains not found (386).

Age

Based on its position in the section, it is referred to the upper part of the Upper Moscovian substage.

Age Span:

Beginning stage:

Kasimovian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

307.02

Ending stage:

Kasimovian

Fraction up in the ending stage:

1.0

Ending date (Ma):

303.68

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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