INTRODUCTION. 5 



Daring the season 1869-7 0, I was deputed to revise the maps with 

 special reference to the sub-trappean formations, regarding which con- 

 siderable increase in our knowledge had been derived from the examina- 

 tion of other areas, since the time when the first geological map of the 

 Rajmehal hills was completed. The map which is now published is, 

 therefore, a compilation from the work of different officers of the Survey, 

 and no one individual is responsible for it as a whole. From a topo- 

 graphical point of view it is far from being as accurate as might 

 be desired. The physical features of some parts of the hills were 

 originally very imperfectly represented, and during the quarter of a 

 century which has elapsed since it was made, the positions and names of 

 a large portion of the villages have been altered. 



( 159 ) 



