Hissarak Fm
Period:
Paleogene
Age Interval:
Lower Oligocene, K1, D1, C2, C2a, S5
Province:
SW Tajik, North Tajik, Central W Tajik
Type Locality and Naming
Includes in Khation Region, Sughd Region, Darvaz district, Dushanbe - west Shirkent-Luchob, Dushanbe - east Shirkent-Luchob.
Synonym:
Lithology and Thickness
Greenish-grey sandstones and reddish-brown mudstones, siltstones and sandstones, rare gypsum interbeds and stromatolites at the base. 0 to 130 m.
Lithology Pattern:
Clayey sandstone
Relationships and Distribution
Lower contact
Overlies the claystone of the Sanglak Fm.
Upper contact
Overlain by the gypsiferous claystone of the Surysay-TajikBasin Fm
Regional extent
Afghan-Tajik Basin.
GeoJSON
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Fossils
Stromatolites at the base.
Age
Lower Oligocene
Age Span:
Beginning stage:
Rupelian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
33.90
Ending stage:
Rupelian
Fraction up in the ending stage:
1.0
Ending date (Ma):
27.29
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Bosboom, R., Mandic, O., Dupont‐Nivet, G., Proust, J. N., Ormukov, C., & Aminov, J. (2017). Late Eocene palaeogeography of the proto‐Paratethys Sea in Central Asia (NW China, southern Kyrgyzstan and SW Tajikistan). Geological Society, London, Special Publications, 427, 565–588. https://doi.org/10.1144/SP427.11.