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

Shakhsay Formation

Shakhsay Fm

Period:

Devonian

Age Interval:

Famennian, Z1a

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Named after the Shakhsay, right tributary of the Dzhilandy River, Zeravshan-Gissar mountain region. E.G. Fedorov et al., 1992. Stratotype on the right bank of the Shakhsay.

Synonym: Shakhsay Series,

Lithology and Thickness

Meat-red claystone (argillites) with layers of thin-bedded jasper-like cherts and lenticular interlayers of limestones Thickness 60m.

Lithology Pattern:

Pelagic marl

Relationships and Distribution

Lower contact

Overlies conformably the Akbasay Fm

Upper contact

Overlain transgressively by the Dzhilandy series (= Dzhilandin Fm, see Zirabulak-Ziaetdin region - Ziaedin mountains -- -- BUT, Dzhilandin base "Arbitrary base Pragian? - "Lower Devonian?" => can't be the unit above.).

Regional extent

Zeravshan-Gissar mountain region, has local distribution.

GeoJSON

null

Fossils

Contains conodonts - Palmatolepis triangularis Sann., P. gracilis gracilis Br. et Mehl., P. minuta cf. loba Helms., P. cf. glabra Ulr. et Bassl., P. crepida Sann., P. rhomboidea Sann., P. Marginifera Helms., P. perlobata schindewolfi Muller; foraminifers - Tuberitina maljavkini Mikh., Parathurammina cf. crassitheca Antr., Archaesphaera minima Sul., Uicinesphaera cf. squalida Antr., Eovolutina cf. elementa Antr., Asteraphaera cf. pulchra Reitl.

Age

Late Devonian, Famennian

Age Span:

Beginning stage:

Famennian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

371.10

Ending stage:

Famennian

Fraction up in the ending stage:

1.0

Ending date (Ma):

359.30

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)”