104 



On the Fossils of the Eastern Portion, 8fC. 



[July 



through them, by a fracture in the wall which in former times had ap- 

 parently dammed up its waters. The strata have been much disturbed, 

 probably by tlie eruption of the basalt, which is seen at the foot of the 

 sandstone hills on the opposite side of the valley, from which the Gun- 

 dicottah range appears to have been separated. Plate, Section 2d. 

 It should, however, be stated, that ravines formed in this sandstone, by 

 the action of the streams now flowing in them, exhibit abrupt precipices, 

 the opposite sides of Vv'hich correspond to each other as Voysey has 

 described. 



The sections accompanying this paper were constructed by Captain 

 Smith, of the Madras Engineers, F. R. S., from information contained 

 in my notes made during several journeys in the lines represented, and 

 from some published papers. The information is by no means complete, 

 but, I believe, it will be found to be correct as far as it goes. In conse- 

 quence of the great length of the lines to be represented, and the com- 

 paratively moderate height of the hills, it would have been impossible 

 to have given the different formations of sufficient size to have been 

 seen in a distinct manner without great distortion of the strata, had the 

 whole distance been represented. Breaks, therefore, have been intro- 

 duced, representing the continuance of the same rock for the number 

 of miles specified in each instance. In the Baulpilly valley and in some 

 other localities (Sect. 2) the summits of the hills are almost inaccessi- 

 ble, and it has consequently been impossible to represent them as they 

 occur in the exact line of section. I have therefore been eontent to 

 exhibit the strata as they occur at their bases, with the exception of a 

 few of the hills which have been more carefully examined, and which cor- 

 respond in appearance to those which are as yet unexplored. 



Section 1st passes from the Bangnapilly diamond mines to the valley 

 of the Nerbudda, with the view of connecting Section No. 1, across the 

 peninsula, with a line running north and south through its centre ; and 

 which might easily be continued to the Himalayah mountains to the 

 north and Cejdon to the south. — Transactions of the Geological Society 

 of London. Second Series^ vol. 5, part 3ypp. 537-575. 



