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Nandeli Shale Formation
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Nandeli Shale Fm base reconstruction

Nandeli Shale Fm

Period: 
Tonian

Age Interval: 
late Tonian


Province: 
Proterozoic S.India Chattisgarh Basin

Type Locality and Naming

Upper formation (2 of 2) of Kharsiya Gr


Lithology and Thickness

Shale, siltstone. Composed mainly of sandstone mudstone heterolith, and is characterized by intense soft sediment deformation in several stratigraphic levels. The deformation is manifested by ball and pillow structures, detached sandstone balls enclosed within red shale, or small sand volcano type structures protruding through shale. Many undeformed thin sheets of sandstone exhibits straight crested ripples, interference ripples and rain prints covering large areas of sandstone-pavements. The upper part of the sequence is shale dominated.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Underlain by Sarnadih Sandstone Fm with gradational contact

Upper contact

Unconformity, overlain by Gondwana Supergroup (which begins with early Permian glacial Talchir Fm)

Regional extent


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[81.42,21.75],[82.88,21.97],[84.01,21.19],[83.12,20.65],[82.75,21.2],[82.1,20.02],[80.9,20.64],[81.42,21.75]]]]}}

Fossils


Age 


Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
776.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.9

    Ending date (Ma):  
748.00

Depositional setting

Muddy shelf, especially for the upper shale-dominated interval.


Depositional pattern:  


Additional Information


Compiler:  

From: Saha D. (Dilip), Patranabis-Deb, S., and Colllins, A.S. (2016) Proterozoic stratigraphy of southern Indian cratons and global context. In: Stratigraphy & Timescales, 1: 1-59.