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Bogra Formation
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Bogra Fm base reconstruction

Bogra Fm

Period: 
Paleogene

Age Interval: 
Oligocene


Province: 
Bangladesh NW

Type Locality and Naming


Lithology and Thickness

Interbedded sandstone and mudstone with high sand ratio. About 165 m thick.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Unconformably overlies the Kopili Fm shale (uppermost Jaintai Gr)

Upper contact

Disconformably overlain by the Jamalganj Fm

Regional extent

Stable platform of NW Bangladesh. "In West Bengal, the Bogra Formation equivalent rocks comprise the Memari Fm and Burdwan Fm. The Burdwan Fm (about 200 m thick) represents the sandier proximal facies, while the Memari Fm (about 150 m) is the more distal and muddy deltaic facies (BOGMC, 1986; Lindsay et al., 1991). The Bogra Formation equivalent unit, known as the Barail Fm, is well developed in Assam, India and also occurs in the northern part of Province 2 (the southeast Bangladesh facies of deep basin and pro-delta).


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[89.25,23.94],[90.18,24.9],[90.59,25.17],[89.87,25.3],[89.8,25.59],[88.95,25.6],[89.022,25.26],[88.48,25.22],[87.95,24.64],[89.25,23.94]]]]}}

Fossils


Age 


Age Span: 

    Beginning stage: 
Priabonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
37.71

    Ending stage: 
Chattian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
23.89

Depositional setting

"distal deltaic to marine (inner to outer shelf).


Depositional pattern:  


Additional Information


Compiler:  

Extracts from Md. Shamsul Islam and Md. Jahangir Alam (2009, "Geological aspects of soil formation in Bangladesh", conference paper in ResearchGate); and from Md. Alam et al. (2003, "An overview of the sedimentary geology of the Bengal Basin in relation to the regional tectonic framework and basin-fill history", Sedimentary Geology, 155: 179-208.)