Azatbash Formation

Azatbash Fm

Period:

Cretaceous

Age Interval:

Barremian - upper Aptian, CK2, CK5a, CK8, CK9, C11

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Along Azatbash, Karzhantau Ridge. N.E. Minakova, 1941 (298, p. 20, 23). Stratotype not specified. The Azatbash suite was distinguished in the volume of basal conglomerates (298); G.A. Belenky (96; 97) increased the volume of the suite, including in it the red sandstones and clays of the overlying Chanak suite.

Synonym: Azatbash Suite, Азатбашская св.

Lithology and Thickness

Spotted red-colored breccias, conglomerate-breccias, conglomerates, sandstones with individual layers of red sandy clays. Thickness 15-150m.

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

Transgressively overlies the Paleozoic or Changi Fm (Upper Triassic(?) - Lower Jurassic(?)),

Upper contact

with erosion overlain by the Kyzylatin Fm

Regional extent

Prishashkent Chuli, foothills of Chatkal and Karzhantau Ridges, in the Tashkent depression, the suite is exposed by boreholes.

GeoJSON

null

Fossils

Age

Belongs to the Upper Barremian-Aptian; Along A., to the Lower Cretaceous; Along O.A. Fedorenko et al. (478), probable age of the Azatbash suite is Berriasian-Early Barremian. Along the "Decision ... 1977" (383) - Upper Barremian-Late Aptian; in the Strat. vol. (446) and, Along G.A. Belenky, belongs to the Aptian; (452) - to the Berriasian-Hauterivian.

Age Span:

Beginning stage:

Barremian

Fraction up in beginning stage:

0.8

Beginning date (Ma):

122.42

Ending stage:

Aptian

Fraction up in the ending stage:

0.8

Ending date (Ma):

114.84

Depositional setting

Deluvial-proluvial deposits.

Depositional pattern:

Additional Information

Compiler:

I.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)”