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

Dzhalkyr-Aymakhal Formation

Dzhalkyr-Aymakhal Fm

Period:

Devonian

Age Interval:

Lochkovian-Pragian, Z5

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Along the ridges of Dzhalkyr and Aimakhal, Zirabulak-Ziaetdin Mountains. V.S. Korsakov, E.S. Sorokin, E.I. Barkovskaya, 1960 (165, p.65).

Synonym: Dzhalkyr-Aimakhalskaya Suite, Джалкыраймахальская св.

Lithology and Thickness

Banded, gray to black, slightly dolomitic, often siliceous, amphiporoid, layered limestones Thickness 550-850m.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Lower boundary stratigraphically conformable with the Pyazyn Fm

Upper contact

Upper boundary is conformable with the Maizak Fm.

Regional extent

Zirabulak-Ziaetdin Mountains, ridges of Dzhalkyr and Aimakhal. Is an age equivalent of the Kochkarlin Fm.

GeoJSON

null

Fossils

Contains tabulates - Favosites ex gr. socialis Sok. et Tes., F. sp. (cf. tomensis Miron.), F. sp. (cf. concentricus Rukh.), F. ex gr. admirabilis Dubat., Striatopora sp. (cf. peetzi settedabanica Dubat.), Sguameofavosites ex gr. bohemicus Pocta., Thamnopora sp.; rugosans - Tryplasma ex gr. altaica (Dyb.); Protathyris praecursor Koz.

Age

Early Devonian, Lochkovian and Pragian (first half) periods.

Age Span:

Beginning stage:

Lochkovian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

419.00

Ending stage:

Pragian

Fraction up in the ending stage:

0.5

Ending date (Ma):

411.46

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)”