CAPE IRIZAR 65 



is about 10 miles in length by about 2 miles in width. The general appearance of 

 Cape Irizar and the coast in its neighbourhood is shown on the sketch below 

 (Fig. 17). The observer is looking about W.S.W. up the Clarke Glacier, with Mount 

 Howard in the distance. 



Cape Irizar 



M^ Howard 



Clgaated 

 roches moatonnees 



Our lookait pant 



ClarkcOlacier 



Cape Reynolds 



RocMy point covered with 

 patches ofsm?w»giaaer ice. 



'S*^^^.^«^^^<;,(^;^'^^^. inlet 



" Crack in 6e3 ice with slabs of Sea ice fyrced up by pressure. 



Fig. 17. View of coast looking to W.S.W. at point 8 miles south of Drygalski Ice Barrier Tongue 



The next sketch (Fig. 18) shows Cape Irizar itself, about 600 feet high, foi-med 

 of biotite allanite granite peeping out in places from under the ice calotte. The 



ciader r 

 Ice- 



Basle Dykes cutting porphyritic granite 



I s a 6 

 Red Porphyritic Cranite. 



Basic Dyke 



Fig. 18. DETAILS OF CAPE IRIZAR AND ITS ICE CALOTTE 

 The section below is taken across the basic dj'kes shown in the upper sketch 



granite is intersected by an interesting group of kersantite dykes, described by 

 Dr. Mawson in his chapter relating to the petrology of this area. 



On either side of the dykes, for a distance of a few feet, the felspars of the 

 granite were deeply reddened as the result of contact metamorphism. This granite 

 was also traversed by acid dykes, apparently aplitic in character, and of earlier 

 origin than the basic dykes. These acid dykes are lenticular in character. 



