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

Malyand Formation

Malyand Fm

Period:

Proterozoic

Age Interval:

Fortunian, B1

Province:
Bukhara-SW Gissar

Type Locality and Naming

Along the Malanddarya River, Surkhan Range. V. A. Khokhlov, L. P. Ignatieva in 1967 (73, p.98). Middle formation in the Surkhantau Gr

Synonym: Malyandskaya Suite, Малянская св.

Lithology and Thickness

Uniform biotite plagiogneisses and crystalline schists with rare layers of amphibole gneisses and granitogneisses. The rocks of the suite have undergone green schist diaphthoresis (silicification, chloritization, muscovitization), as a result of which most of the plagiogneisses have turned into quartz-muscovite-chlorite schists. In the upper part of the suite, layers of orthoschists, the relict structures of which and the chemical composition indicate the primary tuffaceous nature of the rocks. Thickness more than 1500m.

Lithology Pattern:

Gneiss

Relationships and Distribution

Lower contact

According to (?) it lies on the Malyangur Fm

Upper contact

Continuously transitioning into the Khandizin Fm. A. V. Pokrovsky (349) believes that the suite transgressively overlies the Khandizin Fm with basal conglomerates at the base, occupying a higher position in the section, and dates it to the Lower Paleozoic.

Regional extent

Southwest Gissar, basins of the Runigsay, Anga, and Zauzak rivers (307).

GeoJSON

null

Fossils

Age

In the Strat. Sl. (442) it is conditionally assigned to the Lower Proterozoic.

Age Span:

Beginning stage:

Fortunian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

538.80

Ending stage:

Fortunian

Fraction up in the ending stage:

1.0

Ending date (Ma):

529.00

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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