24 BUNDELCUND. 



of complicated faulting requires some thought ; I can only say that 



as far as I could believe the facts, this alternative had also to be rejected 



and accordingly I am bound to accept the idea that this Tirhosvan group 



was originally so limited. 



There is at first sight a strong temptation to a fault in the very marked 



straightness and persistency of the boundary. To 

 Not faulted. . 



relieve this i may point to the parallel line 01 



junction, equally long, and, if overlapping extensions be cut off, equally 

 straight, this has no recent connection with faulting, i. e., since the com- 

 mencement of the ' Semri' period ; it is not then as if in the other direc- 

 tion the group had a wide spread. Moreover, in suggesting a fault of 

 that character the probability of a proportional magnitude in ' throw' 

 must be considered. In speaking here of faults, I of course mean 

 * through faults' ; cracks and consequent ' slips,' occur abundantly among 

 the disturbed rocks I have noticed. 



My objections then to a fault are these : It must be Pre-Vindhyan, 

 the top beds of the Vindhyans being at many points traceable continuously 

 in the same horizon across the supposed line. 



Suppose then a fault underlying to S. E. along which the entire Semri 

 group went down, the limestone being of course the last to disappear. 

 All the disturbed rocks now seen on the S. E. side of this line must 

 either be Vindhyan, or we have to suppose for them a new inter- 

 mediate group — which never reached the surface on the N. W. side, 

 for there the Vindhyan sandstone rests on the level surface of the 

 Tirhowan beds. 



If the fault were anything of a large one, the thickness of this filling- 

 in rock would be no trifle — and its peculiar disturbance more difficult 

 to account for. A heave in the other direction, though suggested in the 

 Boghin valley on the supposition of the limestone there being of the 

 Tirhowan group, would only increase enormously the difficulty of the 

 denudation hypothesis. 



