Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

Main source = Baratov, R.B., et al. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Publishing House "Donish", Dushanbe, 269 pp. plus tables. Provided by Dr. Jovid Aminov, Nazarbayev University, Astana, Kazakhstan Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

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Magian Formation

Magian Fm

Period:

Devonian

Age Interval:

Eifelian-Givetian (D₂), C1, C1a, C1b, C1c

Province:
Central W Tajik

Type Locality and Naming

Includes in Hisar-Zarafshan ranges, and Obisafit, Turkparidin, Chakykalya typesections. (Decisions,1959).

Synonym: Magianskaya suite, аrианская свита, Maghian Suite

Reference section:

Lithology and Thickness

It has a two-member structure.

The lower part (320 m) is composed of thin- and medium-bedded limestones with nodules and interbeds of chert.

The upper part (500-700 m) is composed of organically-fragmented layered and massive limestones with layers of cherts.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

The Magian Fm lies conformably on the Shut Fm in the Obisafit type section, and in the Turkparadinsky type section, also conformably on the Turkparidin Fm.

Upper contact

The Maghian suite is overlain with a stratigraphic disconformity by the Marguzor Fm.

Regional extent

They are distinguished in the Zarafshan-Gissar region. D.A. Stashnin regards the Dzhiyzhikrut layer as a chronological equivalent of the Maghian suite, consisting of carbonate and terrigenous rocks with layers of cherts, described in 1970 by A.A. Kasyanov in the Dzhiyzhikrut river basin. It was previously attributed to the Upper Paleozoic by Z.Z. Muf'tiev (1970).

GeoJSON

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Fossils

In the lower part, the rocks contain remains of Upper Emsian amphiporids Amphipora contexta Yavor., Amph. ex. gr. ramosa Phill.; tabulate corals Favosites regularissimus Yanet, F. goldfussi d'Orb.; гониатитов Erbenoceras advolvens (Erben), Gyroceratites laevis (Eichenb.); ругоз Calceola sandalina I.am.; тентакулитов Nowakia cancellata Richter, Styliolina cf. uralica G. Ljasch. (Ким, Ларин, 1966; Лаврусевич и др., 1973а).

In the upper part, Fossils found here include Eifelian tabulates Favosites robustus Sok., rugose corals Calceola sandalina Lam.; brachiopods Megastrophia uralensis (Vern.); Productella mesodevonica Nal., and above, fossils of Givetian tabulates Caliapora cf. battersbyi M. Edw. et H.; rugose corals Dendrostella trigemme Quendst. and brachiopods Stringocephalus burtini Defr.

Age

Eifelian-Givetian

Age Span:

Beginning stage:

Eifelian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

389.80

Ending stage:

Givetian

Fraction up in the ending stage:

1.0

Ending date (Ma):

378.90

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Extracted from Baratov, R. B. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Donish, Dushanbe, 276.