The different geological formations occurring in the Vidisha district are :-  
     a) Alluvium
     b) Laterite
     c) Deccan Trap with inter-trapped beds
     Alluvium occurs over a large part of the area particularly along the course of streams like Betwa, Sagar, Besh etc. It consists mainly of a yellow or grey brown sandy clay and contains a large proportions of 'Kankers '. Along the Betwa River it often forms steep cliffs in the Northern part of the area.
     These occur in some places as caps on some high trap hills, but generally as ferruginous cellular rocks capping low lying Deccan trap hills, in places surrounded by alluvium. These are used mainly as a road metal.
Deccan Trap with inter-trapped beds
     The Deccan Trap is the most widespread rock formation in this district. These rocks are horizontal or nearly horizontal, the dark Lava flows lend to the countryside a terraced appearance. The principal rock is a basalt having vesicles filled with zeolite, agate, calcite, etc.
     The inter-trappeans, mainly impure crystalline limestone and cacareous chert occur as a residual blocks and boulders scatteres over a surface as well as discontinuous outcrops amidst the Deccan Trap. Small isolated outcrops of intertrappeans mostly lime stone are also present in Vidisha.