Isiiskaja Fm
Period:
Cambrian
Age Interval:
Upper Cambrian (Є? iš), T1
Province:
East Tajik (NE Pamir)
Type Locality and Naming
Includes in Turzguny-Terezki thrust sheet. It was delineated by E. Ya. Leven (1960).
Synonym: Ishiyskaya suite, Ишийская свита, Ishiy Fm
Reference section:
Lithology and Thickness
It is composed of zeolitically altered trachyphonolites, dacites, albiteporphyrites, orthophyre, and diabases, enclosing interbeds of phyllitic slates and quartzitic sandstones (Budanov, 1964b). The incomplete thickness is 1000 m.
Lithology Pattern:
Sandy_claystone
Relationships and Distribution
Lower contact
The base of the suite is not exposed.
Upper contact
It is overlain conformably by the Toutash Fm
Regional extent
It is widespread in the eastern part of the Sarykol district.
GeoJSON
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Fossils
It contains remnants of algae from the upper Cambrian - lower Ordovician
Age
Fossil data determines the attribution of the Isiiskaja Fm to the Cambrian.
Age Span:
Beginning stage:
Paibian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
497.00
Ending stage:
Jiangshanian
Fraction up in the ending stage:
1.0
Ending date (Ma):
491.00
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Extracted from Rutte, D., L. Ratschbacher, S. Schneider, K. Stübner, M. A. Stearns, M. A. Gulzar, and B. R. Hacker (2017), Building the Pamir-Tibetan Plateau—Crustal stacking, extensional collapse, and lateral extrusion in the Central Pamir: 1. Geometry and kinematics, Tectonics, 36, 342–384, doi:10.1002/2016TC004293.