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Sullavai Gr
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Sullavai Gr base reconstruction

Sullavai Gr

Period: 
Tonian

Age Interval: 
late Tonian


Province: 
Proterozoic S.India Pranhita-Godavari west basin

Type Locality and Naming


Lithology and Thickness

Sandstone: a lower Encharani Fm and an upper Venkatpur Sandstone Fm. It represents an extensive red sandstone deposit with subordinate conglomerate, practically devoid of any shale or carbonates unlike the older groups.

[Figure: Pranhita-Godavari valley basin Field photographs illustrating lithology and sedimentary structures. (A) Bollapalli Fm - Sandstones. (B) Pandikunta Limestone Fm - Stromatolites. (C) lower part of Mulug Gr - Intercalated conglomerate and sandstone. (D) Rajaram Fm - Limestones. (E) Sullavai Gr Venkatpur Sandstone Fm - Large aeolian cross-strata. (F) Albaka Gr - Cross-stratified sandstone. (G) Somandevara Quartzite Fm - Rippled unit. (H) Bodela Vagu Fm - Laminated lime mudstone. (I) Somnur Fm - Heterolithic sandstone-shale with profuse desiccation crack in-fills. (J) Tarur Nala Fm - Ash beds of Kotturu Somanpalli. (K) Tarur Nala Fm - Graywacke-shale turbidite with cherty intervals. (from Saha et al., 2016)]


Lithology Pattern: 
Coarse-grained sandstone


Relationships and Distribution

Lower contact

Unconformity onto the Satnala Shale Fm at the top of the Pengnaga Gr

Upper contact

Unconformity; overlain by Gondwana Supergroup (which begins with early Permian glacial Talchir Fm).

Regional extent

Approximately coeval with Usur Gr in Pranhita-Godavari east basin


GeoJSON

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Fossils


Age 


Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
804.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.9

    Ending date (Ma):  
748.00

Depositional setting

Alluvial fan to braid plain; then desert sand dunes (ergs)


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.