216 AUSTRALASIAN ANTARCTIC EXPEDITION. 



Fig. 3. Specimen of hornblende gneiss which has been fractured by frost. It was 

 collected from the moraines at Cape Denison, and the two halves of the boulder were 

 found lying within a few feet of one another. The fracture plane does not correspond 

 with the direction of the schistosity. 



Fig. 4. Specimen of granodiorite gneiss showing curved foliation planes. Collected 

 in situ from Cape Denison. 



Fig. 5. Specimen of granodiorite gneiss showing a banded character, Cape Denison. 



Fig. 6. Specimen of aplitic gneiss showing a large crystal of allanite. Collected 

 in situ, Cape Denison. 



PLATE XII. 



Figs. 1, 2, 3, are photographs of biotite felspar gneiss, Nos. 144, 146-1, 146-2, of 

 similar composition. Collected from within a few feet of one another at Cape Denison. 

 The porphyritic character is a metamorphic variation, and has nothing to do with the 

 original character of the rocks, because these rocks are considered to be metamorphic 

 hybrids. 



Fig. 4. Specimen showing a thread of grey gneiss between two portions of dark 

 biotite felspar gneiss, No. 145. The boundary on either side of the grey gneiss is indefinite 

 as a result of metamorphic diffusion. 



Fig. 5. Specimen No. 372, collected from the moraines at Cape Denison. The 

 apparent sharp junction between the dark amphibolite and the grey granodiorite gneiss 

 is seen. Actually there is a transition and a zone of biotite felspar gneiss separates the 

 two. 



Fig. 6. Specimen of hornblende gneiss from the moraines at Cape Denison. It 

 contains a dark band of amphibolite and shows the normal sharp junction of the 

 amphibolite bands and the granodiorite gneiss at Cape Denison. 



PLATE XIII. 



Fig. 1. External, weathered surface of beach rock (No. 702), Cape Denison. X 4. 



Fig. 2. Cut surface of ditto, showing the cavernous and detrital nature of the 

 rock. X 4. 



Fig. 3. Thin section of the rock, showing angular sand-grains and fine calcareous 

 and detrital cement. X21. 



Fig. 4. Part of thin section passing through the coral fragment. X21. 



PLATE XIV. 



Fig. 1. The junction of the rocky cliffs at Cape Denison and the ice cliffs of 

 Commonwealth Bay at " Land's End." 



