Kyngyr Formation

Kyngyr Fm

Period:

Silurian, Devonian

Age Interval:

Ludlovian-Pragian, K5

Province:
Kyzylkum Region

Type Locality and Naming

By the Kynyr well, Tamdytau Mountains, Central Kyzylkum. Yu.A. Likhachev, V.S. Vladimirsky et al., 1963 (266, p.37). Composition and volume were refined by Sh.Sh. Sabdyushev et al. (392), A.I. Kim, N.M. Larin et al. (1974), A.K. Bukharin et al. (122). The stratigraphic name is not recommended for use.

Synonym: Kyngyrskaya Suite, Кынгырская св.

Lithology and Thickness

Complexly alternating siltstone (aleurolites), argillitic slates, sandstones, conglomerates, gravellites, and limestones, characterized by the presence of lenticular horizons of massive limestones and flaggy sandstones, representing biogenic formations. Thickness 900m.

Lithology Pattern:

Siltstone

Relationships and Distribution

Lower contact

Almost everywhere it is associated with the Kushkumbay Fm, on which it conformably lies

Upper contact

the upper stratigraphic boundary is unknown.

Regional extent

Northern Tamdytau, Kyratass-Teskydak-Kynyr strip, south of the Aktaus ridge. Previously, Upper Paleozoic, Lower Silurian, and Ordovician terrigenous and volcanogenic formations were mistakenly included. The Kyngyr Fm includes the Kosbulak Fm and Koskydak Fm and part of the Lower Devonian carbonates.

GeoJSON

null

Fossils

In the Jengeldy, Jaksan area, graptolites are present in sandstones and argillites - Colonograptus colonus (Barr.), C. roemeri (Barr.), Lobograptus cf. scanicus (Tullb.); in the Kyratass area in sandstones - Pristiograptus cf. bohemicus (Barr.), Lobograptus cf. crinitus (Wood.), in the Jengeldy, Kosbulak area in sandstones and argillites - Neodiversograptus nilssoni Lapw., Saetograptus leintwardinensis Lapw., Lobograptus ex gr. spectatus Urbanek, Monograptus cf. transgrediens (Perner), indicating a late Silurian age within the Ludlovian and Pragian. In the Jengeldy-Kosbulak area, sandstones and limestones contain tabulates - Emmonsiella saaminica Chekh., Favosites sp. (ex gr. effusus Klaam.); in the Kynyr area in limestones - Squameofavosites sokolovi Chekh., Favosites cf. oblongus (Rukh.), Heliolites sp.; in the Jaksan area rugosans - Spongophyllum sedgwicki M.E. et H.; brachiopods - Gypidula cf. rara Nikif, Chonetes cf. verneuili Barr., Stegerhynchus pseudolivonicus Barr.

Age

Based on all paleontological determinations of the fauna, the age of the K. suite can be interpreted as late Silurian (Ludlovian-Pragian) early Devonian (Lochkovian-Pragian).

Age Span:

Beginning stage:

Gorstian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

426.74

Ending stage:

Pragian

Fraction up in the ending stage:

1.0

Ending date (Ma):

410.51

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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