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Viramgam Formation
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Viramgam Fm base reconstruction

Viramgam Fm

Period: 
Cretaceous

Age Interval: 
Late Cretaceous


Province: 
W.India Cambay Basin

Type Locality and Naming

SUBSURFACE: Well Viramgam Structure-I (interval 953.3 m to 1182.5 m+), its thickness is of 229.03 m. [Original Publication: Roy Choudhary, S.C., Mathur, R.B., and Mishra, G.S., 1972: Subsurface stratigraphy of Tharad-Serau area, N.W. Gujarat, Bull. ONGC. Vol. 9(2)]. The sequence has been encountered in Cambay basin subsurface in Viramgam Structure-I below the Deccan Trap and has been designated as the Viramgam Formation by Chowdhary and Kumar (1974). Reference well: Well Detroj-4 (interval 1545 m to 1720 m), its thickness is 175 m.

Synonyms: Roychoudhary et al. (1972) described the formation as the ‘Viramgam Sandstone’.


Lithology and Thickness

Sandstone. In the type section, the formation consists of sandstone, reddish-brown to brick red, white in color, medium- to fine-grained, gritty, highly ferruginous, silty, quartzitic, non-calcareous, current-bedded, intercalated with dolomite at places. Ferruginous matter diminishes towards the lower part where sandstone becomes light pink to white, medium to coarse grained, subangular, translucent, well sorted and non-calcareous with ashy grey algal bedding planes. In reference section, Detroj-4 well, it comprises dominantly of sandstone, coarse- to medium-grained, ferruginous, and quartzitic in nature. In well Dhanduka-1, the Viramgam Formation comprises mainly of coarse-grained sandstones with occasional lateritized claystone.

[Figure 2: Generalized stratigraphy of the Cambay Basin. (from Jaiswal and Bhattacharya, 2018, J.EarthSyst.Sci., 127:65)]


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

The formation in the type well has unconformable relationship with the overlying Deccan Trap and lower contact is not encountered. In Detroj-4 along the western margin in the north, it overlies the Pre-Cambrian Basement gabbro with an unconformity.

Upper contact

In Detroj-4 along the western margin in the north, it overlies the Pre-Cambrian Basement gabbro with an unconformity. In Dhanduka-1, its lower contact with the Dhanduka Fm of Early Cretaceous age is conformable.

Regional extent

It is stratigraphically equivalent to the outcropping Wadhawan Fm of Kutch and Saurashtra.


GeoJSON

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Fossils

The formation is unfossiliferous.


Age 

Late Cretaceous.

Age Span: 

    Beginning stage: 
Cenomanian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
100.50

    Ending stage: 
Campanian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
72.17

Depositional setting


Depositional pattern:  

Additional Information


Compiler:  

D.S.N Raju