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Sundernagar Gr
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Sundernagar Gr base reconstruction

Sundernagar Gr

Period: 
Paleoproterozoic

Age Interval: 
Statherian


Province: 
N.India Lesser Himalaya

Type Locality and Naming

Simla (Shali Basin), named after the town Sundarnagar in Mandi district in the Indian state of Himachal Pradesh. Formerly it was a princely state, known as Suket. [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]

Synonym: Sundarnagar Gr


Lithology and Thickness

Fine-grained sandstone. Sundernagar Gr comprises dominantly purple colored arenaceous sediments with argillities and characterized by interstratified basic lava flows of the Mandi-Darla Volcanics.


Lithology Pattern: 
Fine-grained sandstone


Relationships and Distribution

Lower contact

This is the oldest unit in the Shali Basin.

Upper contact

Unconformable with the Ropri Fm (lowest formation of Shali Gr)

Regional extent

As the history of the Sundernagar Group is closely linked with the events in the northern part of Peninsular India, a correlation is attempted with the pre-Vindhyan groups like the Delhi, Bijawar and Gwalior. The base of this formation is not exposed and the entire edifice of the sequence, ranging from the Shali, Simla, Blaini (Baliana), Infra-Krol, Krol, and the Tertiaries, is built upon this formation making it stratigraphically the deepest sediment in the Peninsular or the Lesser Himalaya (Srikantia, 1977).


GeoJSON

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Fossils

Not reported.


Age 

Early Statherian, based on correlation to the Dharagad Gr with an U/Pb dating of 1800 ± 13 Ma (Miller et al., 2000).. Age span estimates taken from O.N. Bhargava & Birendra Singh (2021 for Dr. Raju's Lexicon); Singh, Birendra P., 2009. Northwest Himalayan Region. In: D.S.N.Raju and Ravi Misra, Proterozoic and Phanerozoic Integrated Stratigraphy (ONGC Bull. 44, n.2)

Age Span: 

    Beginning stage: 
Statherian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,800.00

    Ending stage: 
Statherian

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
1,760.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

O.N. Bhargava & Birendra Singh.