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

Rukhshif Formation

Rukhshif Fm

Period:

Cambrian

Age Interval:

Middle-Upper Cambrian, Z3

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Along the Rukhshif River, Turkestan Range. D.A. Starshinin in 1962 (15, p. 641). Stratotype in the lower reaches of the Rukhshif River, on the right bank, Hypostratotype along the Baykungursay River (N.A. Kozar et al. - Working legend of the KKG map of the Matchinskaya series sheets, 1983).

Synonym: Ruhiiifskaya Suite, Рухшифская св.

Lithology and Thickness

Clayey, sericite-clayey, calcareous slates, interbedded with dark gray flaggy and gray dolomitic and sandy limestones. The rocks are characterized by a pale-yellow color; numerous biostromes and calyptres of cyanobacteria. Thickness 100-290 m.

Lithology Pattern:

Shallow-marine marl

Relationships and Distribution

Lower contact

The lower contact is unknown

Upper contact

The upper contact is conformable with the terrigenous deposits of the Vardashat Fm of the Ordovician.

Regional extent

North, south slopes, and watershed part of the Turkestan Range, small outcrops in Chumkartau.

GeoJSON

null

Fossils

In limestones, trilobites - Homagnostus sp., Ptychagnostus sp., Solenopleuridae, and others, found in middle-upper Cambrian deposits.

Age

D.A. Starshinin initially included the Rukhshif Fm in the composition of the middle Llandovery in 1962, and in 1994 considered it middle-upper Cambrian, A.S. Shadchinen, V.T. Vashurov, and others in 1967 conditionally referred it to the Cambrian. N.A. Kozar, T.I. Khayrullina (15) first characterized this suite paleontologically on the south slope of the Turkestan Range and referred it to the middle-late Cambrian. On the State Geol. Map-500 (460) it is dated as middle-late Cambrian.

Age Span:

Beginning stage:

Drumian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

504.50

Ending stage:

Cambrian Stage 10

Fraction up in the ending stage:

1.0

Ending date (Ma):

486.85

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Z.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)”