Upper Arg Fm
Period:
Devonian
Age Interval:
Lochkovian (D1), C1a, C1b, C1c
Province:
Central W Tajik
Type Locality and Naming
A large part of the Lochkovian stage in sections of all three Obisafit, Turkparidin, and Chakyklalyan type sections is formed by the upper sub-suite of the Arg Fm
Synonym: upper sub-suite of the Arg suite, Arg suite, Argskyio tolshy??
Reference section:
Lithology and Thickness
These are dark gray and black laminated limestones and dolomitic limestones with a thickness of about 150 m.
Lithology Pattern:
Dolomitic limestone
Relationships and Distribution
Lower contact
Upper contact
Regional extent
It is distributed in the Zarafshan-Gissar region.
GeoJSON
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Fossils
with remains of tabulate corals Pachyfavosites kozlowskii Sok.; rugose corals Chavsakia, chavsakiensis Lavrus., Holmophyllum taltiense Nikol.; brachiopods Lissatrypa alexandrina Nikif., characteristic of the Kunjak horizon (Lochkovian stage).
Age
A large part of the Lochkovian stage in sections of all three typesections is formed by the upper sub-suite of the Arg suite
Age Span:
Beginning stage:
Lochkovian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
419.00
Ending stage:
Lochkovian
Fraction up in the ending stage:
0.9
Ending date (Ma):
413.06
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Extracted from Baratov, R. B. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Donish, Dushanbe, 276.