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Sands Formation
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Sands Fm base reconstruction

Sands Fm

Period: 
Statherian

Age Interval: 
late-middle Statherian


Province: 
Proterozoic N.India Vindhyan Basin west

Type Locality and Naming

Lower-middle formation (2 of 4) of Lower Vindhyan series (west Vindyan Basin)


Lithology and Thickness

No details yet given. Upward succession of Bhagwanpura Limestone Member, Sawa Member (sandstone) and Palri Member (shale). The Bhagwanpura Limestone Member is extensively dolomitic in nature with local occurrence of microbialites.


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

Underlain by Satola Fm

Upper contact

Overlain by Kalmai Member (sandstone) of Lasarwan Fm

Regional extent

Bhagwanpura Limestone Mbr (lower Sands Fm) in the Rajasthan sector (west Vindhyan basin) is considered to be the stratigraphic equivalent of the Kajrahat Limestone Member (upper Kajrahat Fm) of the Son Valley (east Vindhyan basin)


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[75.07,24.29],[75.34,25.04],[78.6,26.02],[79.14,23.75],[77.99,24.7],[76.84,24.19],[75.07,24.29]]]]}}

Fossils


Age 

See discussion in Lower Vindhyan Gr; for graphic purposes 1700-1660 Ma

Age Span: 

    Beginning stage: 
Statherian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
1,700.00

    Ending stage: 
Statherian

    Fraction up in the ending stage: 
0.7

    Ending date (Ma):  
1,660.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Main sources: S. Sarkar and S. Banerjee (2020), A Synthesis of Depositional Sequence of the Proterozoic Vindhyan Supergroup in Son Valley, Springer Geology, https://doi.org/10.1007/978-981-32-9551-3_2

Basu, P., and Chakrabarti, R. 2020. Origin and evolution of the Vindhyan Basin: A geochemical perspective. Proc. Indian Natn. Sci. Acad., 86: 111-126.