Plate XI. 



Lens of Garnetiferous Norite near Salem. 



The photograph is taken from a mass of old biotite-gneiss (No. 11,892) 

 looking along the strike of the vertical foliation planes. The part of the hill 

 shown is the east-north-east end of a large lens of garnetiferous norite (No. 11,895) 

 whose long axis runs west-south-west. There are other lenses of the same rock 

 further to the west ; they have their long axes arranged in the same direction 

 but not in line with this or with one another. A similar rock forms the sum- 

 mit ridge of Kanjamalai which can be seen in the distance on the left-hand side of 

 the photograph. This hill and Kanjamalai are the ones referred to by 

 Leschenault de la Tour in his " Relation d'un voyage a Karikal et a Salem " 

 {Mem. du Mus. d'Ht'st. Nat., vol. VI (1820), pp. 343, 344). 



