Kuylyuk Formation

Kuylyuk Fm

Period:

Carboniferous

Age Interval:

upper Tournaisian, CK5a

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Along the Kuylyuk River, basin of the Yangikurgan River, Chatkal Ridge. I.M. Nigmatjanov, 1988 (327, pp. 3-6). Stratotype on the right bank of the Kuylyuk River in its lower reaches.

Synonym: Kuypokskaya Suite, Куйлюкская св.

Lithology and Thickness

Thin-bedded limestones, grayish-brown and grayish-green, clayey, silicified with frequent inclusions of chert in the form of small rounded nodules of light gray color. Surfaces of bedding are uneven, bumpy, often with hieroglyphs of landslides and currents. Development of clayey crusts on the surface of bedding is characteristic, light green in color. In the upper part of the suite, layers of black silicites and interlayers of calcareous-clayey slates appear.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Lies conformably on the Kulosyn Fm

Upper contact

It is conformably overlain by the Karatut-Carb Fm

Regional extent

Chatkal Range (basin of the lower reaches of the Chatkal River, Kulosye River, Yangikurgan, Akbulak, Karaarcha, Ishakkupruk). Laterally, it sharply transitions into coeval biogenic masses of the Sargardon Fm.

GeoJSON

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Fossils

Contains ammonoids - Merocanites djaprakensis Libr., Neopericyclus moldotoensis A.Popov., Ammonellipsites djaprakensis (Libr.); conodonts - Dollymae bouckaerti Groes., Gnathodus typicus Coop., G. pseudosemiglaber T. et F.

Age

Along fauna and position in the section, it belongs to the lower part of the Turonian stage.

Age Span:

Beginning stage:

Tournaisian

Fraction up in beginning stage:

0.7

Beginning date (Ma):

350.50

Ending stage:

Tournaisian

Fraction up in the ending stage:

1.0

Ending date (Ma):

346.73

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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