76 MALLET, VINDHYAN SERIES. 



The fault lines of the Niirsingpm- region were discerned, and from the 

 rectilinear direction of the boundary along the whole course of the Vin- 

 dhyan range, and the fact of no Vindhyan rocks having been found south 

 of their present main boundary, while at the same time no littoral deposits 

 were apparent indicating the original limit of the basin of deposition, it 

 was conjectured that the southern fault was a constant feature along the 

 foot of the Vindhyan escarpment. As explained above, however, there is 

 no evidence of the existence of either fault west of Sateri. The island of 

 vertical sandstone at Pullassi in the Dhar Forest, which was supposed to 

 represent the Kuttungi ridge, is certainly a mere local contortion and un- 

 connected with that ridge in any way. There is a great fault cutting off 

 the Rewahs north-east of Burwai, but neither can this be supposed to be 

 connected with the Kuttungi one, as the down-throw is in the opposite 

 direction. To the east again in the Sone vaUey there is no evidence of 

 the continuation of the fault line. The southern boundaries of both 

 upper and lower Vindhyans are clearly natural, and along the course 

 of the latter we have a markedly littoral deposit in the lower Vindhyan 

 conglomerate. 



East of Buhoribun and in the Rewah country, the Rewah sandstone is 

 generally easily distinguished from the Bundair by its Hthology alone, but 

 the difference gradually diminishes westwards, so that at Hoshungabad 

 there is little or none. By the Hirun river it is still strongly marked 

 enough, the upper Bundairs being ahnost entirely fine-grained, red, very 

 commonly speckled white. The great mass of the Rewahs is coarse 

 greyish-white, although a few fine-grained beds occur like the unspeckled 

 portions of the Bundair. 



The range west from Diori is physically the continuation of the 

 Bundair table-land north of Nursingpur, although composed of a 

 different geological group. It is made up of several irregular ranges, 

 one behind another, all with a scarped face to the south and a reverse 



( 76 ) 



