THE CUDDAPAH SYSTEM. II 



Professor Lacroix has described 1 sillimanite schists from Ceylon 

 •where they apparently occur along with the charnockites of that colony. 

 In India sillimanite schists and charnockite accompany one another 

 quite as their relatives; pyroxene-granulite and granulite, frequently 

 do in Europe. 



Their distribution in Peninsular India so far as at present known 

 is almost subject to the same boundaries as Khondistan or the country 

 of the Khonds. Instead of the awkward descriptive name, garnet- 

 sillimanite-graphite schist, I propose to call these rocks Khondalite, 

 in honour of those fine hill men the Khonds in whose mountain jungles 

 Khondalite is better developed than in any region hitherto described. 

 These rocks are not new to petrology, neither is the selection of a 

 special name imperative, but for the sake of brevity of nomenclature 

 and as a local convenience I trust the new designation will be of 

 service. 



More garnetiferous somewhat massive rock, closely related to the 

 Khondalites, occur frequently on the plain east of the eastern Ghauts 

 from the Godavari to the Mahanadi, and provides most of the blocks 

 used for bridge work and other construction along the East Coast 

 Railway in this region. 



VI,— THE CUDDAPAH SYSTEM. 



The rocks referred to this system resemble in most respects those 

 described under this heading in the preceding report on the Geology 

 of Nawrangapur taluq in Vizagapatam district. Petrologically they 

 resemble the typical Cuddapahs of the south and the Vindhyans to the 

 north. Being non-fossiliferous it is necessary in correlating these 

 rocks, to rely upon petrological characteristics, a not altogether satis- 

 factory method when applied to rocks separated from one another by 

 several hundred miles. 



In the Kalahandi State these rocks occupy a narrow strip along 



1 A. Lacroix : Bulletin de la Societe de Mineralogie, Vol. XII, pp. 59 and 83. 



