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

Akkai Formation

Akkai Fm

Period:

Jurassic

Age Interval:

Middle Kimmeridgian (J₃), Sar1

Province:
East Tajik (easternmost Pamir)

Type Locality and Naming

Includes in Sarykoln district (Istyk type section (Kuntei area)

Synonym: Akkai suite

Reference section:

Lithology and Thickness

It is composed of dark medium- and coarse-bedded dense limestones.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Schematic stratigraphic column indicates the lower contact as Koltchak Fm

Upper contact

Schematic stratigraphic column indicates the upper contact as Kuntei Fm

Regional extent

Kunteisk area, in the basin of the Kuntei River.

GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[75.05,37.32],[74.68,37.44],[74.52,37.63],[74.53,37.68],[74.64,37.8],[74.77,37.77],[74.87,37.72],[74.88,37.66],[74.9,37.61],[74.92,37.56],[75,37.5],[75.04,37.51],[75.09,37.44],[75.1,37.41],[75.07,37.38],[75.09,37.33],[75.05,37.32]]]]}}

Fossils

with remains of Middle Kimmeridgian ammonites - Reineckeia sp., Hecticoceras sp.

Age

The fossil data indicates Middle Kimmeridgian

Age Span:

Beginning stage:

Kimmeridgian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

152.01

Ending stage:

Kimmeridgian

Fraction up in the ending stage:

0.7

Ending date (Ma):

150.90

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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