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Nagri Formation
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Nagri Fm base reconstruction

Nagri Fm

Period: 
Neogene

Age Interval: 
Middle to Late Miocene


Province: 
Pakistan Indus Basin

Type Locality and Naming

Siwalik Gr. – middle formation in the Kohat-Margala Province (Ko-MP and the Trans Indus-Potwar Province (TrI-PP). Holotype section: Nagri village, Talagang District. Hypo: Gaj River section, Dadu District (Kirthar Range). Author: Lewis, 1937. Reference section: Lithology probably same as in the type section.


Lithology and Thickness

Sandstone. The formation consists of sandstone with subordinate clay and conglomerate. The sandstone is greenish grey, medium to coarse grained and massive. The conglomerate have different composition in different areas. In TrI-PP the pebbles consist of igneous rocks and Eocene limestone, and of Kirthar Fm in Sibi area, and nodules of clay and soft sandstone in the KrP.

Thickness: 500-3,500 m. The formation is 700 m thick at the type section. It is 500 m at Mahesian in eastern Potwar, 1,500 m at Khaur, 3,500 m in Surghar Range, 600 m in Urak area, 940 m in Gaj area.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

Conformably underlain by Chinji Fm (transitional).

Upper contact

Conformably overlain by Dhok Fm (transitional).

Regional extent

The formation is widely distributed in the Indus Basin and the Quetta region.


GeoJSON

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Fossils

The formation has yielded fairly rich assemblage of vertebrate remains like Trilophodon angustidens var. palaeoindicus, Pentalophodon falconeri, Dinotherium indicum var. pentapotomiae, Giraffokeryx chinjiensis etc.


Age 

Middle to Late Miocene.

Age Span: 

    Beginning stage: 
Messinian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
7.25

    Ending stage: 
Messinian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
5.34

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Nusrat K. Siddiqui