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Spalga Formation
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Spalga Fm base reconstruction

Spalga Fm

Period: 
Triassic

Age Interval: 
Late Triassic


Province: 
Pakistan Axial Belt

Type Locality and Naming

Holotype section: Spalga village, 17 km SE of Miran Shah, in the northern extremity of the Axial Belt. Author: S. Ahmed, 2000. Reference section: None


Lithology and Thickness

Fine-grained sandstone. The formation consists of sandstone, siltstone and shale. The sandstone is light to dark grey and weathers to rusty brown color. It is fine to medium grained, thin to medium bedded and exhibit circular rims due to color variation called as liasegang. Slump structures and worm burrows are commonly found in the sandstone beds. The shale is greenish grey and weathers to brownish grey with well developed fissility planes. The siltstone is greenish grey to dark grey and weathers rusty brown.


Lithology Pattern: 
Fine-grained sandstone


Relationships and Distribution

Lower contact

The base of the formation is not exposed at the type section.

Upper contact

Upper contact with Sarobi Fm of Triassic age is faulted.

Regional extent

So far reported from Miran Shah area only, in the northern extremity of the Axial Belt.


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

Unfossiliferous.


Age 

The assigned Late Triassic age is based on stratigraphic position and lithological similarity to Late Triassic rocks of the Axial Belt.

Age Span: 

    Beginning stage: 
Carnian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
237.00

    Ending stage: 
Norian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
216.52

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Nusrat K. Siddiqui