228 NILGHIRI HILLS. 



From the absence of any evidence bearing upon the age of these 



Age of Trap not small Outbreaks of trap, it is impossible to say 



whether or not they are connected with the 



great outbreak of the Deccan. Similar dykes have been observed in 



the Mysore country, and it is probable that an 



Trap Dykes in Mysore. 



examination of these, and of the country inter- 

 vening between Mysore and the great trap spread of Central India 

 may enable us to solve the above problem. 



Granite. — It is remarkable that although veins of this rock are of 

 J, . frequent occurrence throughout the Coimbatoor 



Neelghernes. ^^^^ p^^j.^. ^f ^j-^g j;5alem districts, with the excep- 



tion of the Neelgherries and Shevaroys, and perhaps the other hill 

 tracts, that no intruded mass of this rock has been observed. As be- 

 fore mentioned, Sunkerry Droog, to the East of 

 the Bhovani, appears to be a focus where the veins 

 are most numerous, and the hill on which the old fort or Droog stands, 

 as well as the gneiss of the surrounding country to the distance of 



. some miles is perfectly cut up in every direction 

 Mineral composition. 



with granite veins. (See Fig 4). This granite is 



Fig, /K.— Gneiss hill pierced by Granite veins near Sunkerry Droog 



