THE METAMORPHIC ROCKS OF ADELIE LAND. STILLWELL. 



167 



The specific gravity of these hypersthenic gneisses of varying content ranges between 

 2-74 and 2-76, and are comparable with the intermediate members of the Indian 

 charnockite series. They resemble the intermediate charnockites in the irregular distribu- 

 tion of the ferromagnesian silicates and in the prominence of the felspar intergrowths 

 and inclusions. The Antarctic specimens differ from the Indian rocks in the possession 

 of the well-defined garnet rims. 



The primary igneous origin of these intermediate types is determined by analogy 

 with the normal charnockite-like rocks, though the occurrence at the Cape Pigeon Rocks 

 is probably that of an original dyke. 



