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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Isfara Claystones Formation

Isfara Claystones Fm

Period:

Carboniferous

Age Interval:

Upper Moscovian (C2 m), S3

Province:
North Tajik

Type Locality and Naming

Synonym: Mosco stage, Moscovian deposits, Middle Division

Reference section:

Lithology and Thickness

The considered deposits are represented by clay and siliceous slates, siltstones and sandstones, containing layers and lenses of limestone, gravelites, and conglomerates. Their incomplete thickness is 400-500 m.

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

They conformably overlie (often with signs of erosion) the Namurian – Moscovian strata of limestones

Upper contact

Overlying deposits are unknown.

Regional extent

Near the villages of Vorukh and Maidan.

GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[70.78,40.13],[70.76,40.11],[70.66,40.09],[70.65,40.08],[70.65,40.01],[70.61,39.99],[70.58,40.01],[70.55,40.02],[70.54,40.05],[70.51,40.05],[70.56,40.08],[70.7,40.11],[70.78,40.13]]]]}}

Fossils

The described rocks contain remains of foraminifera of the Moscow stage, including those appearing in the late Moscow period, such as Fusulinella cf. subpulchra Putr., Profusulinella ex gr. librovitchi Dutk., Eofusulina cf. subtilissima Putr., and others.

Age

Considering the presence of late Moscow fauna remnants in the underlying strata, the described rocks should be considered part of the upper substage of the Moscow stage.

Age Span:

Beginning stage:

Moscovian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

311.09

Ending stage:

Moscovian

Fraction up in the ending stage:

1.0

Ending date (Ma):

307.02

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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