Chap. IV. 1.] metamorvhic kocks. 55 



noticed at Caroor does not occur here. The foliation is very distinct, 

 some of the folia being of gneiss, or chlorite, or mica, which contrast 

 strongly with the paler coloured limestone. Small detached portions of 

 gneiss, granitoid gneiss, and nests of quartz and calcite are sometimes 

 observed enclosed in the limestone. 



The limestone in this locality, as will be seen, offers some points of 

 analogy with that of Polliam in the character of the associated rocks ; 

 in both cases there are beds of hornblendic gneiss, curving abruptly at 

 certain points. At Naivailie, however, the foliation is contorted, and 

 many of the laminae are broken in continuity, those of the felspar and 

 quartz assuming an irregular lenticular shape ; while at Polliam and its 

 neighbourhood the foliation of the gneiss is perfectly straight and 

 continuous. Beds of quartzose-gneiss also occur north and south of the 

 limestone in each locality, and small intrusions of granite have taken 

 place. 



We believe that the limestone at these two localities forms part of 



a great fold of the metamorphic strata, — a supposi- 

 Great anticlinal fold. 



tion strengthened by the existence of the great 



anticlinal uxis mentioned above, and by the similarity of peculiar beds 



on either side of the quartzo-felspathic nucleus. In this way the band 



of gneiss extending with few interruptions from Caudputtoor to 



Thandalay (Thandala) corresponds to a band of the same kind of rock 



occurring at Hamchunder, TrimuUay, and Munnikaudan Chuttrum. The 



hornblendic gneiss associated with the limestone also corresponds in the 



two localities. 



Although the limestone occurs so largely in the south-west part of 



the area we are describing, close to many villages, some of which are 



even built upon the wider expanses of the rock, it does not appear to 



have been used in any way by the people, excepting as a stone on which 



to sharpen their knives and hatchets. They prefer the more stubborn 



gneiss as a building stone for their temples, and the more readily collected 



(277 ) 



