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

Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple

Isfara Siltstones Formation

Isfara Siltstones Fm

Period:

Carboniferous

Age Interval:

Lower Moscovian (C2 m), S3

Province:
North Tajik

Type Locality and Naming

Synonym: Mosco stage, Moscovian deposits, Middle Division

Reference section:

Lithology and Thickness

Sandstones, siltstones, and clay slates with layers of limestone, gravelites, and conglomerates of incomplete thickness 650 m are exposed.

Lithology Pattern:

Sandy_claystone

Relationships and Distribution

Lower contact

Their base is not exposed

Upper contact

They are overlain transgressively by terrigenous deposits of the upper sub-stage of the Moscow stage - the Upper Carboniferous.

Regional extent

In the valley of the Isfara river, east of the village of Shurab

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

Fossils of Lower Carboniferous brachiopods and foraminifers were found in the pebbles of the conglomerates. In a similar position in the section (at the base of the Upper Paleozoic) in the thickness of the more eastern regions in the low northern foothills of the Turkestan and Alay ridges, remains of the early Moscow fauna were found.

Age

On the basis of fossil data, the considered rocks are conditionally considered Lower Moscovian.

Age Span:

Beginning stage:

Moscovian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

315.15

Ending stage:

Moscovian

Fraction up in the ending stage:

0.5

Ending date (Ma):

311.09

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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