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Jutana Formation
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Jutana Fm base reconstruction

Jutana Fm

Period: 
Cambrian

Age Interval: 
Early Cambrian to early Middle Cambrian


Province: 
Pakistan Indus Basin

Type Locality and Naming

Holotype section: Near Jutana village, Eastern Salt Range (northern Indus Basin). Hypo: Saiyiduwali section, Khisor Range. Author: S.M.I. Shah, 1977.

Reference section: Being suggested by Nusrat K. Siddiqui; the lithology is similar to the type section, however in Khisor Range it is conformably overlain by the Khisor Formation, which is equivalent to the Baghanwala Formation of the Eastern Salt Range.


Lithology and Thickness

Dolomite. It is composed of cliff forming, thick-bedded to massive, brownish weathering, sandy dolomite and dolomitic sandstones with few shale intercalations. It is interbedded with light colored, fine grained calcareous sandstone in the lower part, having flaggy bands containing 'fucoid' markings, while upper part represents massive and brecciated dolomite.

Thickness: 50-163 m. The thickest exposure of the formation is in the type locality where it is 80 m thick; it thins westward and is 50 m thick in the suggested reference section, while in subsurface 163 m of the formation was drilled in Marvi-1 well.


Lithology Pattern: 
Dolomite


Relationships and Distribution

Lower contact

Conformably underlain by Kussak Fm

Upper contact

Conformably overlain by Baghanwala Fm in Salt Range and by Khisor Fm in Khisor Range.

Regional extent

The formation is well exposed in the Salt Range escarpment but is absent in the Western Salt Range. It again appears in the Khisor Range. It has also been encountered in wells drilled in eastern Potwar, and those on the Punjab Platform; farther south it is encountered in subsurface in east Badin area.


GeoJSON

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Fossils

Lingulella fuchsia sp., Botsfordia granulates sp., Redlichia noetlingi sp.


Age 

Early Cambrian to early Middle Cambrian.

Age Span: 

    Beginning stage: 
Wuliuan

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
506.75

    Ending stage: 
Drumian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
500.50

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Nusrat K. Siddiqui