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Shahabad Limestone Formation
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Shahabad Limestone Fm base reconstruction

Shahabad Limestone Fm

Period: 
Tonian

Age Interval: 
Late Tonian


Province: 
Proterozoic S.India Bhima Basin

Type Locality and Naming

Lower formation (2 of 5) in Bhima Gr


Lithology and Thickness

Limestone. Sand-free flaggy limestone (Fig – image C).

[Figure Bhima Gr gield photographs illustrating lithology and sedimentary structures. Rabanpalli Fm - (A) Granule conglomerate and coarse grained sandstone alternation; and (B) Thick-bedded, planar cross-stratified beds alternating with planar parallel beds. (C) Shahabad Limestone Fm - limestone-marl rhythmite. (D) Gray flaggy limestone (Katamdevarahalli Limestone Fm), over brown shale of Halkal Fm. Note sharp contact (black arrow) between the two. (from Saha et al., 2016)]


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Underlain by Rabanpalli Fm sandstone

Upper contact

Disconformity; then Halkal Fm shale

Regional extent


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[76.16,16.21],[76.11,16.48],[76.75,17.15],[77.43,17.45],[77.69,17.2],[76.16,16.21]]]]}}

Fossils


Age 


Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.78

    Beginning date (Ma): 
781.60

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
776.00

Depositional setting

Non-stromatolitic carbonate platform. Detailed facies classification and cyclicity analysis shows that it represents a non-rimmed carbonate platform.


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.