()2 GEOLOGY OF THE SON VALLEY, ETC. 



of rocks, for the next volcanic outbreak at the time of the lower 

 Yindhyans was of acid lavas, and later again we have the basic flows 

 of the later Deccan-trap period. It is true that there elapsed such 

 a long period between the formation of each of these three volcanic 

 systems, that there may be no connection between them. 



( 92 ) 



