BETWEEN THE SON AND THE BANAS. 1 19 



The chief features of the disturbance of this tract appear to be a 

 series of strike faults running about north-east by east with upthrow 

 to the north-west, crossed by other faults running about east and 

 west, whose upthrow is indifferently on the north or south. This 

 band of faulting probably extends into the transition area, where it 

 cannot be traced owing to want of contrast in the rocks. Over a 

 limited area it is detected owing to the fact that fragments of the 

 red shale series have been preserved, resting with a dip of 45 to 6o° 

 to north-west by north on an eroded surface of transition schists. 



The southern limit of this zone of complicated faulting is the 

 great fault, with downthrow to the north, 



Lower Vindhyan. 



forming the northern boundary of the lower 

 Vindhyan outlier whose exposure in the Samdin valley has just been 

 described. 



East of the Samdin the uppermost beds of this outlier can be' 

 traced for about 3^ miles, when the outlier narrows to a width of 

 about half a mile and the highest beds seen belong to the porcellanite 

 stage. The basal conglomerate can be traced continuously along 

 the southern margin of this outlier to the Banas. West of the 

 Samdin, under the scarp of the upper Vindhyans, it consists of 

 dirty, impure sandstones with scattered pebbles, overlaid by red 

 sandstone and sandy shale. In the gorge of the Samdin its exposure 

 has already been described. Traced eastwards it forms an incon- 

 spicuous rise crossing the low ground in a north-easterly direction till 

 it comes into contact with the basal conglomerate of the red shale 

 series, the two combining to form a conspicuous ridge on the north- 

 ern slope of which a contact section was seen showing the lower 

 Vindhyan basal conglomerate resting unconformably on the sand- 

 stone of the basal beds of the red shale series. 



Further north-east the lower Vindhyans are in contact with the 

 red shales, and north of Nakni the conglomerate, which forms, a 

 conspicuous ridge, is very coarse, containing boulders a foot and 

 more in diameter. Hence it is traceable to the Banas, but nowhere 

 so coarse-grained as north of Nakni. 



( '19 ) 



