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Kaladgi Gr
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Kaladgi Gr base reconstruction

Kaladgi Gr

Period: 
Orosirian

Age Interval: 
Middle and Late Orosirian


Province: 
Proterozoic S.India Kaladgi Basin

Type Locality and Naming

Named after the Kaladgi Basin on northern margin of the western Dharwar craton.


Lithology and Thickness

Two main shallowing-upward cycles. Lower cycle (Lokapur Subgroup) has 6 formations from a lower Ramdurg Fm conglomerate and sandstone, followed by slate and dolomitic marls of the Malaprabha Fm, Yargatti Fm, Yendigree Fm, Muddapur Fm and Yadhalli Fm. After a disconformity, the Upper cycle (Simikere Subgroup) has a lower Kundargi Fm of conglomerate and sandstone, followed by slate and chert of Arlikatti Fm and Hoskatti Fm. The Kaladgi Gr has a maximum aggregate thickness of ca. 3900 m – 2750 m for Lokapur Subgroup and 1150 m for Simikeri Subgroup.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Major angular unconformity on Dharwar schist, Hungund schist belt, Closepet granite (Archean)

Upper contact

Angular unconformity, overlain by Kerur Fm conglomerate at base of Badami Gr = Basement uplift, folding and a hiatus in deposition follow the first cycle (Kaladgi Gr) of sedimentation in the Kaladgi Basin

Regional extent


GeoJSON

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Fossils


Age 

No definite ages for the basins were available, but tentative age from the stromatolites is suggested to be Meso-to-Neoproterozoic for Kaladgi.

Age Span: 

    Beginning stage: 
Orosirian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
1,950.00

    Ending stage: 
Orosirian

    Fraction up in the ending stage: 
0.75

    Ending date (Ma):  
1,862.50

Depositional setting

Mainly a muddy tidal flat, with base of the two cycles being Alluvial fan or fan-delta.


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.