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Chak Jabbi Limestone Formation
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Chak Jabbi Limestone Fm base reconstruction

Chak Jabbi Limestone Fm

Period: 
Triassic

Age Interval: 
Middle Triassic


Province: 
Pakistan Indus Basin

Type Locality and Naming

Holotype section: Near Bagh village, Kalachitta Range (Kohat-Margala Province). Hypo: North of Chak Jabbi Forest Rest House, Kalachitta Range. Author: A. N. Fatmi, 1972. Reference section: At the reference section, it is exposed in a faulted outcrop. Same lithology as in the type section.

Synonym: Chak Jabbi Limestone, Chak Jabbi Fm


Lithology and Thickness

Limestone. It consists of thin to medium-bedded (15-60 cm thick) grey, light grey weathering brownish grey, sub-lithographic limestone which has not yielded any fossils. It forms lowest beds exposed east of Hattar Cement Factory where it is mined as a raw material for cement. The formation is slope forming, with characteristic light grey weathering color.

Thickness: 30 m at the type section.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Conformably underlain by Mianwali Fm

Upper contact

Conformably overlain by Kingriali Fm (gradational).

Regional extent

The formation is exposed in the core of the Bagh and Chak Jabbi anticlines in the Kalachitta Range (Kohat-Margala Province). The Bagh locality provides a complete section; hence, Fatmi (1968) has designated it as the principal reference section that lies 1 km east-southeast of Bagh village. The unit grades into the overlying Kingriali Fm; its stratigraphic position is thus similar to that of the Tredian Fm of Salt Range and Trans Indus-Potwar Province (TrI-PP).


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[70.24,33.83],[73.2,33.98],[73.25,29.19],[71.92,27.83],[69.94,27.51],[71.13,24.45],[68.07,23.68],[67.03,25.04],[66.21,28.1],[67.47,30.37],[69.52,30.42],[70.24,33.83]]]]}}

Fossils

Unfossiliferous.


Age 

Middle Triassic. (based on its stratigraphic position).

Age Span: 

    Beginning stage: 
Anisian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
246.70

    Ending stage: 
Ladinian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
237.00

Depositional setting


Depositional pattern:  


Additional Information

EMW: Raw material for cement.


Compiler:  

Nusrat K. Siddiqui