Neogene

Paleogene

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

Mesoproterozoic

Paleoproterozoic

Main source = Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian) Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

Kimerek Formation

Kimerek Fm

Period:

Triassic

Age Interval:

Rhaetian, B3

Province:
Bukhara-SW Gissar

Type Locality and Naming

Near the Kimerik Plateau, Bukhara-Karshinsky District. V.P. Alekseev, A.V. Troitsky et al., 1990 (52, pp. 34-39). The stratotype is the section of well 4 on the Kimerik Plateau. The Kimerik Fm was identified as unit "zh" or the Kimerik rhythmic suite, and the sandy layers of the Kimerik Fm are identified as the XX industrial horizon. It is included in the Sandzhar industrial Fm.

Synonym: Kimerek Suite, Кимерекская св.

Lithology and Thickness

The Lower part consists of rhythmic interbedding of claystones (argillites), polymictic sandstones, gravels, and coals. The rocks have medium apparent resistivity (AR) values ranging from 10 to 25 Ohm, negative SP anomalies, and low gamma activity, with good reservoir properties, and porosity (KP) reaching 30%. Carbonaceous and clayey sediments are characterized by low AR values (3-4 Ohm). The thickness of the lower part is up to 250 m. The Upper part consists of fine-grained rocks - siltstone (aleurolites), carbonaceous claystones (argillites) with coal layers. On the AR curve, it is distinguished by low values. The thickness is up to 250 m.

The total thickness is up to 500 m.

Lithology Pattern:

Sandy_claystone

Relationships and Distribution

Lower contact

Underlying deposits are not exposed.

Upper contact

The Kimerik Fm is transgressively overlain by the Gurud Fm.

Regional extent

Pitnyak Uplift (Sultan-Sandjar, Tyuyamuyun), Bukhara-Karshinsky district.

GeoJSON

null

Fossils

On the Kimerik Plateau, well 4, interval 3230-3400 m, Y.M. Kuzichkina identified Early Jurassic spore and pollen complexes: Cyathidites minor Cauper (2,0), C. hausmannioides Kuz. (6,0), Dictyophyllidites sp. (10), Todisporites minor Couper (0,5), Cyclogranisporites muensterioides Kuz. (1,0), Osmundacidites sp. (0,5), O. jyrassicus (Kara-Murza) (0,5), O. tuberculatus (Klimka) (3,0), O. angrenicus Kuz. (8,0), Verrucosisporites sp. (1,5), Corrugatisporites scanicus Nilsson (1,0), Tripartina variabilis Mal. (4,0), Protocaniferus funarius (Naum.) Bolch. (20,0), Piceapollenites sp. (3,0), Abiespollenites sp. (2,0), Inaperturopollenites sp. (2,5), Classopolis sp. (3,5), Ginkgocycadophytus sp. (5,5), Monosulcites minimus Cauper (21,5).

In the Pitnyak Uplift (Sultan-Sandjar and Tyuyamuyun Plateaus) and the lower reaches of the Amudarya River, a spore and pollen complex - Pinus sp., Separatisacculina sp., Striatopinites sp., Lebochia sp., etc. (458) was identified.

Age

The spore and pollen complex does not contradict the Early Jurassic age. By analogy with the facial analogue of the Sandzhar Fm, the age of the Kimerik Fm is conditionally determined as Late Triassic - Early Jurassic (?).

Age Span:

Beginning stage:

Rhaetian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

205.74

Ending stage:

Toarcian

Fraction up in the ending stage:

1.0

Ending date (Ma):

174.70

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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