26 MALLET^ VINDHYAN SERIES. 



wards the upper end, it accumulates to a great depth, and is subsequently 

 cut into deep channels by the periodic rains. To the leeward of the 

 hills, an eddy is formed in the air, by which the finer particles suspended 

 in it are deposited, and in course of time give rise to a hill, sometimes 

 almost rivalling in size the one to which it owes its existence. 



The Vindhyans of Bundelkund having been reported on by Mr. 

 H. B. Medlicott in 1860, their further examination in the upper Sone 

 valley was taken up in 1860-61 by Mr. J. G. Medlicott and myself. 

 During the next season Mr. C. A. Hacket^s services were similarly 

 directed further east, since which time he and myself have been princi- 

 pally engaged on these rocks ; Mr. Hacket in Bundelkund and the noi-th- 

 ern portion of the map, the whole of which to the north of Sipri is 

 exclusively due to him. Mr. Medlicott has also spent a considerable time 

 in their examination in the Sone valley, and their westerly extension 

 towards Neemuch. During the last two seasons, Mr. W. L. WiUsonhas 

 carried on the investigation in the Saugor and Jubbulpore districts, 

 while the Dhar forest is principally due to Mr. W. T. Blanford. My 

 own work has been chiefly on the upper Vindhyan area, between Sasseram 

 and Dumoh, and in the Nerbudda valley. The present report is intended, 

 therefore, to combine the work and results of all these observers. 



( 2«3 ) 



