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Jakaram Conglomerate Formation
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Jakaram Conglomerate Fm base reconstruction

Jakaram Conglomerate Fm

Period: 
Calymmian

Age Interval: 
basal Calymmian


Province: 
Proterozoic S.India Pranhita-Godavari west basin

Type Locality and Naming

Lower formation (1 of 4) of Mulag Gr

Synonym or coeval: Damala Gutta Conglomerate Fm


Lithology and Thickness

Conglomerate and sandstone (see Fig. – image C)

[Figure: Pranhita-Godavari valley basin Field photographs illustrating lithology and sedimentary structures. (A) Bollapalli Fm - Sandstones. (B) Pandikunta Limestone Fm - Stromatolites. (C) Jakaram Conglomerate Fm (Damala Gutta Conglomerate Fm) in 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: 
Conglomerate


Relationships and Distribution

Lower contact

Unconformity, overlies Karlai Shale Fm (Pandikunta Shale Fm) at top of Mallamapalli Gr

Upper contact

Regional extent

Approximately coeval with Bodela Vagu Fm of Somanpalli Gr in Pranhita-Godavari east basin


GeoJSON

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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: 
0.05

    Ending date (Ma):  
1,590.00

Depositional setting

Coastal alluvial fan; followed by tidal flat and shoreface


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.