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Hooghly Formation
Click to display on map of the Ancient World at:
Hooghly Fm base reconstruction

Hooghly Fm

Period: 
Paleogene

Age Interval: 
Late Eocene.


Province: 
NE.India West Bengal Basin

Type Locality and Naming

Type section is in the well Golf Green-1, Interval is 5200-5324 m and the thickness is 124 m. [Original Publication: Chandra, M., Mallik, S., Das, D., Thakur, R.K. and Sinha, M.K. (1993) Lithostratigraphy of Petroliferous Basins, Document IX, West Bengal Basin, KDMIPE ONGC Publication, pp 1-216]

[Figure 1: Location map showing tectonic elements and drilled wells (after R.N Dwivedi in Raju and Misra, 2009)]


Lithology and Thickness

Shallow-marine marl. In the type section, the lithology comprises of grey to dark grey calcareous shale.

[Figure 1: West Bengal Basin lithostratigraphy (after R.N. Dwivedi in Raju and Misra, 2009) with red-arrow showing position of this formation]


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

Lower boundary with Kalighat Fm.

Upper contact

Upper boundary with Matla Fm and Burdwan Fm.

Regional extent


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[87.89,24.6],[87.36,24.5],[87.45,24.17],[87.05,23.44],[86.77,22.56],[87.02,21.86],[87.96,20.59],[89.27,20.91],[88.98,23.19],[88.71,23.28],[88.79,23.47],[88.75,23.47],[88.57,23.73],[88.71,23.92],[88.7,24.24],[87.89,24.6]]]]}}

Fossils

Foraminifera recorded are dominated by larger foraminifera N. fabianii and Pellatispira sp. assemblage.


Age 

A Late Eocene age is suggested based on above assemblage. It is equivalent to the Kopili Fm of Northeastern Himalaya.

Age Span: 

    Beginning stage: 
Priabonian

    Fraction up in beginning stage: 
0.6

    Beginning date (Ma): 
35.43

    Ending stage: 
Rupelian

    Fraction up in the ending stage: 
0.15

    Ending date (Ma):  
32.91

Depositional setting

Shallow inner shelf conditions based on recorded foraminifera.


Depositional pattern:  


Additional Information


Compiler:  

D.S.N Raju