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Simla Gr
Click to display on map of the Ancient World at:
Simla Gr base reconstruction

Simla Gr

Period: 
Neoproterozoic

Age Interval: 
Late Tonian


Province: 
N.India Lesser Himalaya

Type Locality and Naming

Simla (Shali Basin), [Original Publication: Srikantia, S. V. and Sharma, R.P. 1976.Geology of the Shali Belt and adjoining areas. Memoirs Geological Survey of India, 106 (1), 31-166.]


Lithology and Thickness

Sandstone, shale, siltstone, limestone. Upward succession of Basantpur Fm dolomitic limestone, Chhaossa Fm siltstone, and Sanjauli Fm clayey sandstone.

[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 Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Conformable with the Sanjauli Fm / Chhaossa Fm.

Upper contact

Conformable with the Blaini Fm, and unconformable with the Subathu Fm.

Regional extent

Can be correlated with Jaunsar Gr. The Nathuakhan Fm (Uttarakhand) is also equivalent of the Simla/Jaunsar sequences. The Benighat Slates in Nepal (Dhital 2014) and the Puntsholing and Pangsari formations in Bhutan (Tangri 1995a; Bhargava 1995b) are equivalents of the Simla/ Jaunsar Gr. (Bhargava et al., 2021. Evolution of the Lesser Himalaya in space and time. Himalayan Geology, Vol. 42 (2), 2021, pp. 263-289)


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


Age 

Ediacaran. Age span estimates taken from Kumar, S., Brookfield, M.E. 1987. Sedimentary Environment of the Simla Group (Upper Precambrian), Lesser Himalaya and their paleotectonic significance. Sedimentary Geology, 52(1-2), 27-43.

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
606.14

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.7

    Ending date (Ma):  
567.66

Depositional setting

Delta platform and distributary channel deposit in Sanjauli Fm, a shelf-mud transition zone of a tidal flat complex in Chhaossa Fm, Marine, shallow to subtidal marine rifted basin in Basantpur Fm.


Depositional pattern:  


Additional Information


Compiler:  

O.N. Bhargava & Birendra Singh.