Uzunkuduk-LCret Formation

Uzunkuduk-LCret Fm

Period:

Cretaceous

Age Interval:

Lower Cretaceous (upper Albian), U2

Province:
Ustyurt-Sultanuzdag

Type Locality and Naming

Near the village of Uzunkuduk, Central Kyzylkum. I.M. Abdurazimova, E.M. Shvetsova, 1987 (27, p. 56).

Synonym: Uzunkuduk Suite, Узункудукская св.

Lithology and Thickness

Lagoonal-continental, rarely marine, variegated, predominantly red-colored, clays, siltstone (aleurolites), sandstones with layers of gravelites and conglomerates. Thickness 20-106 m.

Lithology Pattern:

Claystone

Relationships and Distribution

Lower contact

Conformably overlies and is eroded in Central Kyzylkum on the Dzhamanjar Fm (Jamanyar suite); in Western Ustyurt, South Pre-Aral, Pitnyak Uplift - on the Sultanbobin Fm.

Upper contact

Conformably overlain in Central Kyzylkum by the Shuruk-Cret Fm; on Western Ustyurt, South Pre-Aral - by the Kenes Fm; on the Pitnyak Uplift - by the Sultansandjar Fm.

Regional extent

Western Ustyurt, South, Southeast Pre-Aral, Central Kyzylkum, Pitnyak Uplift, Khorezm Depression. Exposed by boreholes. Stratotype - section of borehole 37, 8 km west of the village of Uzunkuduk, western end of the Auminzatau Mountains.

GeoJSON

null

Fossils

Contains foraminifera - Haplophragmoides rosaceus Subb., H. umbilicatulus Dain, Pseudobolivina curviseriata Mam.; complex of spores and pollen (%) - Taurocusporites reduneus (Bolch.) Stov. (0-4), Stenozonotriletes radiatus Chl. (0-2), Gleicheniidites senonicus Ross (4-32), G. laetus Bolch. (1-9), Ornamentifera echinata (Grig.) Bolch. (0-1), Classopollis sp. (2-15), Inaperturopollenites Dubius (Pot. et Ver.) Th. et Pf. (4-33), Trocolpites sp. (1-2).

Age

Belongs to the Upper Albian.

Age Span:

Beginning stage:

Albian

Fraction up in beginning stage:

0.6

Beginning date (Ma):

105.58

Ending stage:

Turonian

Fraction up in the ending stage:

0.5

Ending date (Ma):

91.65

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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