NERBUDDA DISTRICT. 251 



dykes found within this area take the same course, and run more or less 



exactly east and west. T^his fact may also bo 

 Trap dykes. , 



noticed on the map. Many exceptions to the rule 



occur, as may also be seen, but the general tendency is not the less 



remarkable* 



Of the age of the Faults. 



When describing the faults, I reserved the question of their relative 



Hypothetical nature of a S es for se P arate discussion, principally because 

 the enquiry. j t j nvo l V es considerations more hypothetical than 



any thing hitherto advanced, and which, for this reason, it seemed advise 

 able to keep distinct from the simple description of phenomena. 



In the foregoing pages the fault systems traceable throughout our 



district have been described separately, under the following heads. — 



1st. The Mahadeva fault, that which forms the north boundary of 



the Mahadeva, and Lameta groups^ and, towards the north east, of 



the upper Damuda rocks. 



2nd. The faults which form the boundaries of the lower Damuda 



and Talcheer group, one on the north, and one on the south. 

 3rd. The Yindhyan fault, forming the boundary on the south of that 



great series. 

 4th. The great number of smaller disturbances, whose existence and 

 direction are marked by the lines of breccia : these are grouped 

 together for convenience sake alone, as there is no evidence that 

 all these faults have been produced at the same time or even within 

 the same geological period. 

 Considering these systems of faults, as thus classified, the question of 



their relative age is beset by many difficulties. 

 Newer disturbances _ . 



effacing the traces of All those movements ot which we can trace the 



results among the more recent deposits, must of 



course have affected the underlying and more ancient formations as well; 



and must therefore have often obscured, or altogether effaced, the traces 



