Basal Fm
Period:
Triassic
Age Interval:
Middle-Late Triassic (P2+3), S4
Province:
North Tajik
Type Locality and Naming
Synonym: basal suite
Reference section:
Lithology and Thickness
Basal Fm consists of conglomerates, quartz gravelites, and sandstones with interlayers and lenses of claystones. The power is 2070 m.
Lithology Pattern:
Aus Conglomerate
Relationships and Distribution
Lower contact
The deposits lie with a sharp angular unconformity on the Paleozoic rocks
Upper contact
overlain discordantly by the Upper Cretaceous.
Regional extent
In the southern part of the Turkestan region, J1+2 deposits are exposed along the rivers Kshut, Zauran, Rivat, Surhat.
GeoJSON
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Fossils
Age
The Middle-Late Triassic age of the suite is determined by the spore-pollen complex.
Age Span:
Beginning stage:
Ladinian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
239.23
Ending stage:
Carnian
Fraction up in the ending stage:
1.0
Ending date (Ma):
227.30
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Extracted from Baratov, R. B. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Donish, Dushanbe, 276.