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

Shalyn Beds Formation

Shalyn Beds Fm

Period:

Silurian

Age Interval:

Ludlovian, N2

Province:
Nuratau

Type Locality and Naming

Along the Shaly stream, southern slope of the Dzhalpak Mountains, N. Nuratau ridge. A.I. Kim, N.M. Larin, 1966 (368, pp.92-93). Lower beds in the Chaltash Fm

Synonym: Shalyn Layers, Шалынские сл., Shaly Beds

Lithology and Thickness

Brecciated rocks, which gradually overlap with fine- and medium-grained sandstones with numerous organic detritus. Upper part of the layer - rhythmic interbedding of limestone conglomerate-breccias, organogenic-clastic limestones, and ferruginous-carbonate rocks. Thickness 110-160m.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Shalyn Beds Fm lie on Abartkan Beds Fm, stratigraphic contacts are conformable.

Upper contact

They are overlain by Chashmazrak Beds Fm, stratigraphic contacts are conformable.

Regional extent

GeoJSON

null

Fossils

Contains stromatoporoids - Ecclimadictyon quasifastigiatum Bogojavl.; tabulates Squameofavosites isfaraensis Chekh., Emmonsiella ex gr. saaminica (Chekh.); rugosans Zelophyllum conicum Bulw., Mukophyllum crateroides Ether., Kodonophyllum truncatum (Linn.); brachiopods - Atrypoidea linguata columbella Barr., Atrypopsis megaerella (Plod.), Gypidula incipiens Barr., Nikiforovaena lynxoides (Nal.), N. isfarensis (Nikif.), N. favositicus Nikif., Alaskospira dunbariK. et Ams.; conodonts - Ozarcodina crispa (Wall.).

Age

They belong to the Ludlovian stage of the Upper Silurian.

Age Span:

Beginning stage:

Ludfordian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

425.01

Ending stage:

Ludfordian

Fraction up in the ending stage:

1.0

Ending date (Ma):

422.73

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)”