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Somanpalli Gr
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Somanpalli Gr base reconstruction

Somanpalli Gr

Period: 
Calymmian

Age Interval: 
early Calymmian


Province: 
Proterozoic S.India Pranhita-Godavari east basin

Type Locality and Naming

A deformed mixed carbonate-siliciclastic succession occurring around the confluence of Indravati and Godavari rivers in the eastern Proterozoic belt and lying unconformably below the Albaka Gr has been designated as the Somanpalli Group


Lithology and Thickness

Sandstone, Chert and Claystone. Upward succession of Bodela Vagu Fm, Somnur Fm, Gutta Chert Fm, Tarur Nala Fm, Kopela Shale Fm and Po Gutta Sandstone


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Unconformably underlain by Kotapalle Limestone Fm of upper Devalmari Gr

Upper contact

Unconformably overlain by Somandevra Quartzite Fm of lower Albaka Gr

Regional extent

Approximately coeval with Mulug Gr of Pranhita-Godavari west basin


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[79.28,20.07],[79.69,19.75],[81.77,16.74],[81.4,16.64],[79.6,19.08],[79.27,19.75],[79.28,20.07]]]]}}

Fossils


Age 


Age Span: 

    Beginning stage: 
Calymmian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,600.00

    Ending stage: 
Calymmian

    Fraction up in the ending stage: 
0.25

    Ending date (Ma):  
1,550.00

Depositional setting

Upward deepening from intertidal flats to deep shelf, then shallowing to shoreface. Although the mixed carbonate-siliciclastic successions of the Bodela Vagu Fm and the Somnur Fm represent tidal shelf deposition, the Tarur Nala Fm and the Pedda Gutta Chert Fm represent deep-shelf setting with common turbidite deposits. The thick succession of black shales of the Kopela Shale Fm has been interpreted as representing pelagic mud deposition indicating maximum sea-level rise; a reversal to tidal shelf environment of deposition is attested by the Po Gutta Fm.


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.