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Chashmai Kharsai Formation
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Chashmai Kharsai Fm base reconstruction

Chashmai Kharsai Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous


Province: 
Pakistan Axial Belt

Type Locality and Naming

Holotype section: Chashmai Kharsi section. Author: S. Ahmed et al., 2000. Reference section: None.


Lithology and Thickness

Claystone. It is dominantly composed of shale of dark green color, weathering to rusty brown with purple tint; at places contains glauconitic sandy layers. The shale is highly fossiliferous and is full of belemnites.

Thickness: 30 m at the type locality.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

Disconformably underlain by Isha Fm.

Upper contact

Conformably overlain by Marsikhel Fm (gradational).

Regional extent

Exposed along Mirali-Miran Shah road in Kurram Agency area.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[67.03,24.87],[66.04,25.61],[66.09,28.57],[67.1,30.57],[69.17,30.95],[69.76,33.06],[70.05,32.94],[69.54,30.45],[67.49,30.41],[66.19,28.13],[67.03,24.87]]]]}}

Fossils

Belemnites.


Age 

Early Cretaceous.

Age Span: 

    Beginning stage: 
Berriasian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
143.10

    Ending stage: 
Hauterivian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
126.50

Depositional setting


Depositional pattern:  


Additional Information

EMW: Chichali and Sembar formations are considered source rocks for the hydrocarbons found in Indus Basin. Chashmai Kharsai could be a potential hydrocarbon source for rock in the northern Axial Belt.


Compiler:  

Nusrat K. Siddiqui