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InfraKrol Formation
Click to display on map of the Ancient World at:
InfraKrol Fm base reconstruction

InfraKrol Fm

Period: 
Neoproterozoic

Age Interval: 
Cryogenian (636-650 Ma)


Province: 
N.India Lesser Himalaya

Type Locality and Naming

Himachal Pradesh-Uttarakhand, [Original Publication: Ganqing Jiang, Nicholas Christie-Blick, Alan J. Kaufman, Dhiraj M. Banerjee, and Vibhuti Rai, J.B., 2002. Sequence Stratigraphy of the Neoproterozoic Krol Platform. Journal of Sedimentary Research, Vol. 72, No. 4, July, 2002, P. 524–542.]

[Figure: part of Himachal Pradesh geologic map showing relationships among Chhaossa Fm, Sanjauli Fm, InfraKrol Fm, Blaini Fm, Kakara Fm and Subathu Fm (provided by O.N. Bhargava & Birendra Singh)]


Lithology and Thickness

Fine-grained sandstone. Up to 400 m of shale, siltstone, and minor sandstone assigned to the InfraKrol Formation. (G.Jiang et al., 2002)


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

Conformable with Blaini Fm

Upper contact

Conformable with KrolA Fm

Regional extent

Himachal Pradesh and Uttarakhand. Can be correlated with Chambaghat Fm, Krol Sandstone Fm. Age span estimates taken from Webb, A.A.G, Yin, A., Harrison, T.M, Célérier, J, Gehrels, G.E, Manning, C.E, Marty, G.M. 2011. Cenozoic tectonic history of the Himachal Himalaya (north-western India) and its constraints on the formation mechanism of the Himalayan orogen. Geosphere, 7(4), 1013-1061.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[76.86,32.93],[76.28,33.02],[76.81,31.7],[77.38,30.95],[79.23,29.66],[80.13,29.32],[80.37,29.97],[79.78,30.1],[78.44,31.25],[77.6,31.59],[77.56,32],[76.86,32.93]]]]}}

Fossils

Not available.


Age 

Assumed to be lower ca 20% of Ediacaran following relative proportions of Krol, gap?, and Infra-Krol in (H. Xu, J.G. Meert and M.K. Pandit, Geoscience Frontiers 13 (2022)

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.03

    Beginning date (Ma): 
632.11

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.20

    Ending date (Ma):  
615.76

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

O.N. Bhargava & Birendra Singh.