78 GLACIOLOGY 



junctions with the Penck between the two headlands to the left of the left-hand 

 figure. 



Depot Island appears to form the eastern limb of a strong anticline in the gneissic 

 granite. It is remarkable for the extraordinary numbers of large enclosures of a 

 diorite containing very large crystals of sphene.* Large enclosures of quartzite, up 

 to fully 10 feet in length, are present in the gneissic granite of the western limb of 

 the anticline. 



Depot Island. . 



140 f above sea ^ 



CneissicGrdniCe mith large 



enclosures of diorite. 



Depot '■ / / 



,DENUDED ANTICLINE- 



ffOcAy Headland capped by thin ice 

 . about 200 P above sea. 





_ Sea Ice. 



Enclosures "^ 

 of greenish grey qudrCzite 

 10 f long by 5f' thick, and JZ-^^ 

 — thinly laminated in ■'■ 

 gneissic granite. 



Fig. 34. VIEW LOOKING SOUTH 



Depot Island and the adjacent headland to the south, Cape Ross, have both been 

 intensely glaciated. Depot Island is 140 feet above the sea, and Cape Ross about 

 200 feet. An interesting feature at this point, and from here to Granite Harbour, 

 15 miles farther to the south, is that the piedmont, which is here extensively 

 developed, is clearly seen to rest for considerable distances on a solid platform 

 of granite. 



Cape Ross, 2 miles south of Depot Island, is formed of gneissic granite, with 



Cape Ross 



Depot Island 



,-g:'>..,».^v— g^ 



Sea lee 



Fig. .35. VIEW OF COAST NEAR DEPOT ISLAND 



Taken from point 2 miles 300 3-aids to the south of the island 



dark grey bands rich in biotite, and with light veins of coarse pegmatite and 

 porphyritic crystals of felspar. The cape is intersected by two sets of dykes, one 

 set of a hornblendic-lamprophyre type, the other yet to be determined. 



The general appearance of this gneiss is shown on Fig. 36. 



At a small rocky point about 5 miles farther south, midway between Cape Ross 

 and Gregory Point, we examined the piedmont ice where it rested on the granite 



* A photograph by Mawson showing these enclosures is given in his petrological volume of this 

 Memoir. 



