THL METAMORPHIC ROCKS OF ADELIE LAND. STILL WELL. 137 



The formation of the anticline* observed at the Madigan Nunatak is probably 

 associated with the pressure movements which produced the crush structures. The 

 banding of the anticline is noted by the foliated character of the rock. 



Correlation. The two types of gneiss from the Madigan Nunatak bear traces of 

 similar metamorphic history. Both are rocks with prominent epi zone metamorphism 

 which has followed kata zone metamorphism. In both cases the passage through 

 the meso zone was fairly rapid, but it is noticed in the partial alteration of the pyroxene 

 and the dissociation of the felspar. 



The chemical likeness between both rocks and the acid and basic members of the 

 Indian charnockite series has been pointed out. A discussion on this inter-relation 

 will be subsequently presented. 



The term " Anticline," as here used, is not strictly correct. An anticline is normally marked by the bedding planes 

 of sedimentary strata. In this case it is marked by the foliation of a gneiss and might be distinguished as a foliation anticline. 



