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Bollapalli Formation
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Bollapalli Fm base reconstruction

Bollapalli Fm

Period: 
Statherian

Age Interval: 
late Statherian


Province: 
Proterozoic S.India Pranhita-Godavari west basin

Type Locality and Naming

Lower formation (1 of 3) of Mallamapalli Gr


Lithology and Thickness

Conglomerate to clayey sandstone (see Fig. – image A)

[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. (from Saha et al., 2016)]


Lithology Pattern: 
Coarse-grained sandstone


Relationships and Distribution

Lower contact

Unconformity onto Karimnagar granulate and granite gneiss

Upper contact

Regional extent

Approximately coeval with Amba Gutta Fm and lower Madhumtorna Shale Fm of Devalmari Gr in Pranhita-Godavari east basin


GeoJSON

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Fossils


Age 


Age Span: 

    Beginning stage: 
Statherian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
1,700.00

    Ending stage: 
Statherian

    Fraction up in the ending stage: 
0.55

    Ending date (Ma):  
1,690.00

Depositional setting

Small alluvial fan to tidal flats and sabkha


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.