Bartang Gr
Period:
Paleogene
Age Interval:
Eocene (P? br), R1
Province:
SE Tajik (SE Pamir)
Type Locality and Naming
It was distinguished in 1938 by A. V. Grigoriev, before that it was described by G. L. Yudin, I. G. Baranov, and S. I. Klunnikov (Dronov, 19635). The above-mentioned researchers did not assign a geographical name to the characterized rocks. The latter was proposed by V. I. Dronov (1963b).
Synonym: Bartang Series, Бартангская серия
Reference section:
Lithology and Thickness
The Bartang Gr consists of two suites (Dronov, 1963b; Budanov and Dronov, 1964). The lower, Bartang Fm (бартангская свита), The upper, Razuchoye Fm (разучская свита)
Lithology Pattern:
Volcanic_ash
Relationships and Distribution
Lower contact
The series lies with erosion on various older rocks.
Upper contact
Overlying sediments older than the Quaternary are unknown.
Regional extent
It is widespread in the western part of the Central Pamir.
GeoJSON
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Fossils
Age
There is still no consensus on the age of the Bartang Gr. Some researchers (Klunnikov, 1935; Vinogradov, Geol. USSR, vol. 24, 1959; Barhatov, 1963) consider it Jurassic, others (Baratov et al., 1969b; Kreydenkov, Raspopin, 1973) - late Jurassic-early Cretaceous. The third group (Tajidinov, 1968) - Cretaceous-early Paleogene, the fourth (Dironov, 1963; Yudanov, Dronov, 1964) - Paleogene. The main argument for the Paleogene age of this thickness is the conformable occurrence of the Bartang volcanic-sedimentary formations on the rudist-bearing limestones of the Upper Cretaceous. Conversely, supporters of a more ancient age of the volcanic deposits do not confirm the presence of rudist remains in the marbleized limestones underlying the rocks of the Bartang Gr. These limestones are attributed by them to the Jurassic system, which, naturally, speaks of a more ancient age of the strata conformably overlying them. This issue requires further resolution.Hence considered Paleogene (Eocene) for schematic stratigraphic representation.
Age Span:
Beginning stage:
Ypresian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
56.00
Ending stage:
Priabonian
Fraction up in the ending stage:
1.0
Ending date (Ma):
33.90
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.