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Chitravati Gr
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Chitravati Gr base reconstruction

Chitravati Gr

Period: 
Orosirian

Age Interval: 
late Orosirian?


Province: 
Proterozoic S.India – Cuddapah basin

Type Locality and Naming

Upper Group of the Cuddapah Supergroup


Lithology and Thickness

Sandstone: Consists of a lower Pulivendla Quartzite Fm, middle Tapatri Fm (with volcanics, of which the mafic sills are dated as ca. 1888 Ma), upper Gandikota Quartzite Fm. Total thickness is 4975 m.

[Figures: Field photographs showing lithology and sedimentary features in the Papaghni Gr and Chitravati Gr of the Cuddapah Supergroup. Gulcheru Quartzite Fm - (A) basal conglomerate overlying granitic basement off Parnapalli; and (B) pebbly grit grading to rough cross-stratified coarse sandstone. (C) Heterolithic sandstone-shale at Gulcheru Quartzite Fm / Vempalle Fm transition. (D) Vempalle Fm - stromatolitic limestone, (E) Pulivendla Quartzite Fm - basal conglomerate; note silicified stromatolite remnant in a large pebble. Tadpatri Fm - (F) silicified stromatolite (hemispheroidal forms) intercalated with basaltic flow (dark band), and (G) shale with a thick mafic sill. Gandikota Quartzite Fm - (H) plateau forming sheet sandstone, (I) cross-stratified sandstone, and (J) interference ripples. (from Saha et al., 2016)]


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

Unconformity onto Vempalle Fm (upper Papaghni Gr)

Upper contact

Tectonic contact, then Bairenkonda Quartzite Fm (lower Nallamalai Gr)

Regional extent


GeoJSON

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Fossils


Age 

Mafic sills of ca. 1900 Ma age in middle; therefore arbitrary put as 1900 to 1850 for graphic purposes (and each formation given ca. 15 Myr with middle claystone spanning more) = mid-Orosirian to upper Orosirian

Age Span: 

    Beginning stage: 
Orosirian

    Fraction up in beginning stage: 
0.6

    Beginning date (Ma): 
1,900.00

    Ending stage: 
Orosirian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
1,850.00

Depositional setting

Subtidal bar in lower part to tidal-influenced bars at top. Sedimentation within the Chitravati Group also saw a strong pulse of mafic igneous activity, indicated by common occurrence of mafic flows and dykes within the Tadpatri 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.