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Spingwar Formation
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Spingwar Fm base reconstruction

Spingwar Fm

Period: 
Jurassic

Age Interval: 
Early Jurassic


Province: 
Pakistan Indus Basin

Type Locality and Naming

Alozai Gr. – lower formation. Holotype section: Spingwar, 35 km NW of Loralai. Author: M. D.Williams, 1959. Reference section: None.


Lithology and Thickness

Clayey limestone. It consists of interbedded dark grey to black limestone and calcareous shales. The limestone is finely crystalline but in some areas, oolitic and shelly beds occur in the upper part, while sandstone beds are present in the lower part.

Thickness: 140-215 m. The formation is more than 665 m in the Zamari Tangi section, 215 m in the Mara Tangi and 140 m in Tazi Kach sections.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

Conformably underlain by Wulagai Fm (transitional).

Upper contact

Conformably overlain by Loralai Fm (transitional).

Regional extent

The formation is widely exposed along a long strip in the northeastern Balochistan between Loralai and Zhob Valley (Axial Belt). [This seems to be the Sulaiman Province = southern Indus Basin?]


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

Ammonites indicate Early Jurassic age.


Age 

Early Jurassic.

Age Span: 

    Beginning stage: 
Hettangian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
200.41

    Ending stage: 
Sinemurian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
192.90

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Nusrat K. Siddiqui