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Shinawari Formation
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Shinawari Fm base reconstruction

Shinawari Fm

Period: 
Jurassic

Age Interval: 
Early Jurassic (Toarcian) to Middle Jurassic


Province: 
Pakistan Indus Basin

Type Locality and Naming

Broach Gr - middle formation: Holotype section: Shinawari village in Samana Range. Hypo: Shaikh Budin Hill, Marwat Range. Author: A.N. Fatmi, 1977. Reference section: None.


Lithology and Thickness

Sandy limestone. It consists of thin to well bedded limestone with nodular marl, calcareous and non-calcareous shale and quartzose, ferruginous and calcareous sandstone. The limestone is grey, brownish grey with fine to coarse texture and includes sandy, oolitic and ferruginous beds. The shale is grey, dark grey, brownish grey, splintery and at places calcareous. Sandstone is white to light grey, brown and occurs in thin and thick beds, having cross bedding and ripple marks.

Thickness: 12 - 400 m It is over 400 m thick (base faulted) in type area, 80 m in Shaikh Budin Hill, 35 m in Bhoje Nallah and 30 m in Broach Nallah of Surghar Range, 12 m in Chak Dalla section in Kalachitta Range and 25 m in Bagnotar section of Hazara.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

Conformably underlain by Datta Fm (transitional contact).

Upper contact

Confromably overlain by Samana Suk Fm (transitional contact).

Regional extent

The formation is widely developed in Kohat-Margala Province (Ko-MP; Kohat, Kalachitta, Hazara), Trans Indus Range (TrIR) and the Salt Range. The formation thins out and disappears west of Kohat.


GeoJSON

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Fossils

Bouleiceras sp., Terebratula sp., Montlivatia sp., Pholadomya sp., Zeilleria sp., Eotrapezium sp. Spiriferina sp., Pecten sp. etc.


Age 

Early Jurassic (Toarcian) to Middle Jurassic

Age Span: 

    Beginning stage: 
Toarcian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
184.20

    Ending stage: 
Aalenian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
170.90

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Nusrat K. Siddiqui