Obilai Fm
Period:
Silurian
Age Interval:
Llandovery-Wenlock (S1), C1
Province:
Central W Tajik
Type Locality and Naming
It is represented in Dukdon type section. (V. Lavrusevya and others. 1973b)
Synonym: Obilaiskaya thickness
Reference section:
Lithology and Thickness
It is composed of variegated clayey limestones with a thickness of 50-70 m.
Lithology Pattern:
Clayey limestone
Relationships and Distribution
Lower contact
Conformably by Archalik Fm of the Ordovician
Upper contact
Regional extent
It is widespread in the Zarafshan-Gissar region, and it is represented in Dukdon type section, developed in the southern part of the Obihundy ridge.
GeoJSON
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Fossils
with remains of Llandovery-Wenlock tabulates Palaeofavosites balticus Rukhin, Favosites forbesi M. Edw. et H.; rugose Ketophyllum sp.; brachiopods Acanthospirifer sp.
Age
Based on the fossil data, it is Llandovery-Wenlock
Age Span:
Beginning stage:
Rhuddanian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
443.07
Ending stage:
Sheinwoodian
Fraction up in the ending stage:
1.0
Ending date (Ma):
430.62
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Extracted from Baratov, R. B. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Donish, Dushanbe, 276.