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Khisor Formation
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Khisor Fm base reconstruction

Khisor Fm

Period: 
Cambrian

Age Interval: 
Middle Cambrian


Province: 
Pakistan Indus Basin

Type Locality and Naming

Holotype section: Saiyiduwali section, Khisor Range. Hypo: Well Marwat-1, 53 m (depth interval, 1960-2013 m). Author: B. R. Hussain, 1960. Reference section: None.


Lithology and Thickness

Evaporite. In the type section, the prevailing lithology is white to light grey, partly dark grey with laminated gypsum and dolomite layers and intercalations of dark grey to black, silty, partly dolomitic shale.

Thickness: 100-135 m. 53 m in Marwat-1 well.


Lithology Pattern: 
Evaporite


Relationships and Distribution

Lower contact

Conformably underlain by Jutana Fm.

Upper contact

Unconformably overlain by Tobra Fm = major hiatus (and erosional removal) until Permian

Regional extent

The formation is limited only to Khisor Range where it is exposed only at the Saiyiduwali section located at SW end of the Khisor Range. Marwat-1 drilled on Marwat Range just north of Saiyiduwali section encountered 53 m of this formation. Its stratigraphic equivalent Baghanwala Formation is fully developed in the Eastern Salt Range.


GeoJSON

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Fossils

The formation is devoid of fossils.


Age 

Middle Cambrian.

Age Span: 

    Beginning stage: 
Guzhangian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
500.50

    Ending stage: 
Paibian

    Fraction up in the ending stage: 
0.0

    Ending date (Ma):  
497.00

Depositional setting

The formation was deposited in lagoonal environment under arid conditions.


Depositional pattern:  


Additional Information

EMW: Gypsum and Dolomite.


Compiler:  

Nusrat K. Siddiqui