254 NERBUDDA DISTRICT* 



of them remained along where their present boundary line runs, while 

 from 10 to 15 miles south of that line no trace of them was left. The 

 fault, as has been stated, fully accounts for all this ; but it is difficult 

 to realize in imagination any condition under which such could, prior to 

 the fault, have been effected. From these consi- 

 derations we are led to the conclusion that the 

 Vindhyan fault is almost certainly older than the lowest Talcheer beds, 



. . and therefore of course than faults No. 1 and No. 

 Supposed state ot the 



ease. 2. It would then be the most ancient of which 



we have any evidence in the district. The Vindhyan beds which had 

 been elevated on the south side of it were removed by denudation before 

 the deposition of the lowest Talcheer beds. Many of the beds of that, 

 and of the lower Damuda groups being possibly formed of the materials, 

 furnished by that denudation. 



Subsequently to the accumulation and consolidation of a great thick* 

 ness of these Talcheer and lower Damuda groups, the faults No. 2, now 

 marking the north and south boundaries of the formation, cut off its 

 beds ; the fault on the south side of the field being a down-throw to the 

 north, and that on the north side of it being a down-throw to the south* 



The upper Damuda and Mahadeva rocks were then deposited, over- 

 lapping frequently the limits of the older sandstones, and their limits 

 of extension to the north were subsequently fixed by the last disturbance 

 to which we are able to assign a date, viz., the Mahadeva fault. 



A very interesting question arises in connection with the parallelism 

 which exists between these different systems of 



Further considerations . , . , . . . 



suggested by the paral- faults. This phenomenon has been pointed out when 



lelism above described. ,,.•.. » ,, , P *. ■, ,. 



the direction of the several faults was under dis- 

 cussion. With reference to the Mahadeva and the Vindhyan faults 

 (No. 1 and No. 3 of our list) a glance at the map will show how very 



