Chap. IV. 2.] metamoephic rocks. 97 



foliation running west by south, east by north, coinciding with the 

 strike of the ridge which is caused by a protruding out-crop which has 

 a dip of 75° south by east, and corresponds with the north side of a 

 great bay in the general curve of the strata to the east, as may be seen 

 by reference to the map. Though the chief magnesite veins inin in the 

 line of foliation, yet other minor ones diverge in various other directions. 

 In size they vary from about one foot in thickness downwards, the aver- 

 age being about 4 or 5 inches across from side to side. Here, as 

 at the " Chalk Hills," the magnesite seems less aifected by disintegrating 

 agencies than the associated rocks, and consequently stands out in sharp 

 rugged little ridges. The hornblendic rock, in which these veins appear, 

 has been in several parts, especially at the western end of the ridge, 

 much altered, and has assumed a brownish and jaspery texture, or is co- 

 vered by a grey or brown impure incrustation. Innumerable fragments 

 of calcedony and coarse jasper are strewn about the surface. These are 

 evidently derived from the breaking up of the smaller veins in which 

 the quantity of accessory siliceous matter is far greater than in the 

 larger magnesite veins. 



At the western extremity of the ridge, the set of veins previously 

 running with the strike of the rocks east by north, generally trends 

 first east-north-east and west-south-west and by south to west-north- 

 west, east-south-east, while a corresponding curve is indicated by the 

 gneiss close by running east west with a northerly dip. The hornblendic 

 gneiss ridge, however, has been denuded away at the curve, and a few 

 3'ards further east, the magnesite veins disappear. 



The eastern termination of the magnesite veins is about three quar- 

 ters of a mile off, where the ground begins to slope rapidly towards the 

 Karavetaur river. The length of the hornblendic gneiss ridge may be 



about a mile and a quarter. For some little dis- 



Maenesian kunkur. , i-i c jt -j • ji 



tance south oi the magnesite veins, the numerous 



kunkur concretions scattered over the fields present a peculiar and 

 N ( 319 ) 



