106 MALLETj VINDHYAN SERIES. 



which the latter having risen several hundred feet, a new coast line 

 was originated in the Eewah scarp; and in the same manner by a 

 subsequent movement the Kymore came into existence. Before stating 

 the objections to this theory it will be well, however, to discuss the 

 minor features or details of denudation. 



The escarpment of the Kymore range which faces the Sone for more 

 than 200 miles between Rotasgurh and Bilheri is a nearly straight 

 line for the entire length/ without any indentation except the curve at 

 Bidjigurh. The northern escarpments, however, the Kymore from 

 Sasseram westward, and the Rewah westwards from Adaisar hill, are 

 deeply indented by intricate, ramifying gorges. Those who support 

 the marine origin of valleys would no doubt explain this by saying that 

 both north and south escarpments are old coast lines, but that the pre- 

 valent winds and oceanic currents had in the main a southerly direction, 

 and by them have been produced the irregularity of outline on the north, 

 while the southern coast protected from these has been denuded ■ in a 

 comparatively straight line. Deferring for the moment the origin of 

 the escarpments themselves, it seems perfectly clear that the details 

 have been cut out by sub-aerial action. The southern escarpment being 

 a line of special elevation and the dip slope being here 10° — 15° to the 

 north, the entire drainage has been determined in a northerly direction. 

 The rivers all traverse the table land and fall over the . northern 

 edge. Hence the southern escarpment has been exposed to no river 

 action, and the northern escarpments have suffered from the entire 

 drainage, and have in consequence been cut back by the several streams 

 into the long deep gorges the latter now flow through. 



If the northern escarpment exposed alternate bands of hard and 

 soft strata dipping at high angles, it would be natural to expect that the 

 sea would, in the course of time, excavate the latter to a certain depth. 

 Even then, however, such bays would be simple, not ramifying. Here, 

 however, the conditions are quite different ; the escarpment exposes 

 almost perfectly horizontal strata, and the same strata along the entire 



C 106 ) 



