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Churtela Shale Formation
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Churtela Shale Fm base reconstruction

Churtela Shale Fm

Period: 
Stenian

Age Interval: 
Late Stenian


Province: 
Proterozoic S.India Chattisgarh Basin

Type Locality and Naming

Uppermost formation (5 of 5) of Raipur Gr

Synomym or equivalent: Tarenga Shale Fm


Lithology and Thickness

Volcanic-claystone. Slate with local dolerite dyke; and is mainly composed of pyroclastics, both coarse and fine ash tuff. (Fig – image A)

[Figure: Volcaniclastics from the Raipur and Kharsiya Groups, Chattisgarh basin. (A) Churtela Shale Fm (Tarenga Shale Fm) - Planar tabular-bedded, cross-stratified, coarse ash tuff bed. (B) Sarnadih Sandstone Fm - Pebbly sandstone with clast derived from underlying tuff units and from the basement. (from Saha et al., 2016)]


Lithology Pattern: 
Volcanic_ash


Relationships and Distribution

Lower contact

Overlies the Saradih Limestone Fm (Chandi Limestone Fm)

Upper contact

Unconformably overlain by Sarnadih Sandstone Fm of lower Kharsiya Gr

Regional extent


GeoJSON

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Fossils


Age 


Age Span: 

    Beginning stage: 
Stenian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
1,100.00

    Ending stage: 
Stenian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
1,000.00

Depositional setting

Pelagic shale. "The carbonate factory was interrupted by deposition of the Churtela/Tarenga Shale which is mainly composed of pyroclastics, both coarse and fine ash tuff. … It is a shallow shelf to offshore mud deposit, with intermittent, which in all likelihood represents a truncated cycle where carbonates were either not deposited or were removed by erosion during the sub- Kharsiya Gr unconformity.


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.