Bursakhirman Fm
Period:
Devonian
Age Interval:
upper Lochkovian – Pragian (D1), C1a
Province:
Central W Tajik
Type Locality and Naming
It is described by A. I. Kim and N. M. Larin (1966) as the Bursakhirman horizon, it is represented in the Obisafit type section, обисафитским.
Synonym: Bursakhirman suite, Бурсыхирманокая свита, обисафитским
Reference section:
Lithology and Thickness
It consists of gray and black limestones with a thickness of 500 m.
Lithology Pattern:
Limestone
Relationships and Distribution
Lower contact
conformably overlaying the Upper Arg Fm.
Upper contact
Regional extent
It is widespread in the Zarafshan-Gissar region.
GeoJSON
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Fossils
They contain remnants of Amphipora Amphipora aff. alaiskensis Yavor.; tabulates Dendropora macropora Dubat.; rugose corals Neomphyma originata Soshk., Fasciphyllum simplex (Vaganova) and brachiopods Atrypopsis thetis (Barr.), characteristic of the Manak and partly Kunjak horizons (Lochkovian - Pragian stages).
Age
From the fossil data, it is considered upper Lochkovian – Pragian
Age Span:
Beginning stage:
Lochkovian
Fraction up in beginning stage:
0.9
Beginning date (Ma):
413.06
Ending stage:
Pragian
Fraction up in the ending stage:
0.3
Ending date (Ma):
411.83
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Extracted from Baratov, R. B. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Donish, Dushanbe, 276.