166 



Åeruginous weatherings on the mountain-walls indicate the 

 presence of copper pyrites or cupriferous iron pyrites. 



Cape Tobin. The southernmost part of Liverpool Land 

 is low and easy of access ; broadly speaking, the rock is fairly 

 monotonous, while in detail it reveals abrupt changes. Predom- 

 inant is a coarse crystalline gneiss, in part grey granitic, in 

 part, and this is the commonest, a banded form, where in the 

 grey gneiss we find irregular, often undulated bands soon 



Fig. 1. Sample of the rock from C. Tobin, showing irregular red 

 bands in the head-mass of grey gneiss. 



pinched out and consisting of a red, rather coarse crystalline 

 mass, which is often purely pegmatitic and then occasionally 

 rich in hornblende, often in the form of large, well developed 

 crystalline individuals. Besides these rocks there are fine-grained 

 hornblende schists ; the different varieties often show alter- 

 nating stratification. 



A coarse, red pegmatite granite corresponds perhaps to 

 the rock which forms the red bands in the grey gneiss, already 



I 



