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

Dhanunjayapur Fm

Period: 
Cretaceous

Age Interval: 
Campanian – Maastrichtian


Province: 
NE.India West Bengal Basin

Type Locality and Naming

Type section is in the well Dhanunjayapur - 1, Interval is 4330-4424 m and thickness is 94 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 216.]

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


Lithology and Thickness

Claystone. In the type section, the formation comprises dark grey shale, at some place, it is silty. In the type section it is of 94 m thick whereas in the well SME-5 (offshore) it is about 500 m thick.

[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: 
Claystone


Relationships and Distribution

Lower contact

Lower boundary is unconformable with the Rajmahal Traps Fm.

Upper contact

Upper boundary is unconformable with the Bolpur Fm.

Regional extent


GeoJSON

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Fossils

Globotruncana linneiana, G. ventricosa, G. arca, G. pseudolinneiana, Rosita petaliformas and Pseudorbitoides sp.


Age 

Late Cretaceous (Campanian – Maastrichtian)

Age Span: 

    Beginning stage: 
Campanian

    Fraction up in beginning stage: 
0.1

    Beginning date (Ma): 
82.50

    Ending stage: 
Campanian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
72.17

Depositional setting

Marine environment (> 70 m)


Depositional pattern:  


Additional Information


Compiler:  

D.S.N Raju