Uru Formation

Uru Fm

Period:

Cretaceous

Age Interval:

lower-middle Cenomanian, K1-K3

Province:
Kyzylkum Region

Type Locality and Naming

Along the Uruk River, Central Kyzylkum, Bukantau Mountains. I.M. Abdurazimova, 1998 (165, p.143). Stratotype in the vicinity of the Uru settlement, Bukantau Mountains.

Synonym: Uruskaya Suite, Urus, Урусская св.

Lithology and Thickness

Continental sands, siltstones, purple, brick-red, cross-bedded with clay lenses, wood remains. At the base, gravelite with large plant remains. Thickness 40-115m. In the suite, two members are distinguished: Argabai and Kul'kuduk.

The Kul'kuduk member (upper member?) is composed of fine-grained, arkosic, lilac sands with cross-bedding. Thickness 31m.

The Argabai member is represented by: layer 1 - fine-grained, arkosic, lilac-gray, cross-bedded sand. Thickness 24m. layer 2 - alternating pinkish-lilac sands and siltstones. Thickness 4m; layer 3 - brick-red siltstone with sand nests. Thickness 8m.

Lithology Pattern:

Fine-grained sandstone

Relationships and Distribution

Lower contact

The suite unconformably overlies the Shuruk-Cret Fm and transgressively overlies the Paleozoic

Upper contact

It is overlain with erosion by the Uchkuduk-Cret Fm.

Regional extent

It is an analogue of the Donguztau Fm.

GeoJSON

null

Fossils

It belongs to the lower-middle Cenomanian.

Age

Age Span:

Beginning stage:

Cenomanian

Fraction up in beginning stage:

0.1

Beginning date (Ma):

99.84

Ending stage:

Cenomanian

Fraction up in the ending stage:

0.45

Ending date (Ma):

97.53

Depositional setting

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)”