Yazgulem Fm
Period:
Proterozoic
Age Interval:
Neoproterozoic (Rf? jz), V1
Province:
SE Tajik (Central W Pamir)
Type Locality and Naming
This is the middle formation in Vanch-Yazgulem Gr
Synonym: Yazgulemskaya formation (Язrулемская свита)
Reference section:
Lithology and Thickness
Formed by calcite and dolomite marbles with layers of graphite-carbonaceous, quartz-sericite shales and quartzites. Formation thickness is 1000-1500 m. In the lower part of the formation, the amount of carbonate and terrigenous rocks is approximately the same, in the upper part, marbles predominate. Their thickness is especially large (up to 700 m) in the valleys of the Sungat, Lyangar, and Rovand rivers.
Lithology Pattern:
Dolomitic limestone
Relationships and Distribution
Lower contact
Upper contact
Regional extent
It is widespread in the western part of the Central Pamir.
GeoJSON
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Fossils
Age
Indicated as Riphean in the extracted literature, hence considered Neoproterozoic (Cryogenian) for schematic stratigraphic representation purpose.
Age Span:
Beginning stage:
Cryogenian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
720.00
Ending stage:
Cryogenian
Fraction up in the ending stage:
1.0
Ending date (Ma):
635.00
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Extracted from Baratov, R. B. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Donish, Lakhsh district, 276.