Shurab Fm
Period:
Jurassic
Age Interval:
Late Jurassic – Bathonian, S4
Province:
North Tajik
Type Locality and Naming
Synonym: Shurab suite, IШурабская свита
Reference section:
Lithology and Thickness
It is represented by a layer of sandstones, clays, and claystones with lens-shaped interlayers of gravelites. It differs from the underlying formations by the low carbon content of the rocks, their motley color. The power of the suite is up to 350 m.
Lithology Pattern:
Sandy_claystone
Relationships and Distribution
Lower contact
It differs from the underlying formations by the low carbon content of the rocks, their motley color.
Upper contact
Regional extent
It is distributed in Turkestan region.
GeoJSON
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Fossils
Plant remains are encountered in this suite.
Age
R. Z. Genkina dates the Shurab suite deposits to the Bathonian and partially the Upper Jurassic. According to T. A. Sixtelle, the considered layer corresponds to the Callovian - Oxfordian and possibly Kimmeridgian. The plant remains encountered in this suite cannot unambiguously answer the question of age. The complex is impoverished, among the remains there are no leading forms of the Bathonian stage and the Upper Jurassic. Therefore, this question remains controversial.
Age Span:
Beginning stage:
Bathonian
Fraction up in beginning stage:
0.8
Beginning date (Ma):
165.87
Ending stage:
Oxfordian
Fraction up in the ending stage:
1.0
Ending date (Ma):
154.78
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Extracted from Baratov, R. B. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Donish, Dushanbe, 276.