THE CONTINENT 



one thousand feet high are composed of red (Beacon?) 

 sandstone containing coal and carbonaceous shales. 

 They are capped by an immense thickness of dolerite 

 sills. Here also gneisses and granites are common and 

 constitute the basal beds. The Gaussberg to the far 

 west is an extinct volcano built of leucite basalt. Even 

 off Enderby Land (49° E.) dredgings by the *'Val- 

 divia" revealed much of the same series of rocks. 



We may conclude this chapter on Antarctic geology 

 by a table indicating the dominant geological forma- 

 tions so far discovered. 



