THE DOLERITES 



OF 



KING GEORGE LAND AND ADELIE LAND, 



r,v 

 W. II. BROWSE, D.Sc. 



(Lecturer in Geology, University of Sydney.) 

 WITH TWO PLATKS. 



CONTENTS. 



PAGE 



I. The Dolerites of the Horn Bluff, King George Land.- 



1. Petrography 246 



2. Order of Consolidation 250 



3. Discussion of the Petrological Features 250 



' 4. Chemical Composition and Relationships 252 



II. Dolerite Erratics from the Moraines, Cape Denison, Adelie Land ... 252 



III. Explanation of Plates 258 



Tin-: most important section of this collection of basic igneous rocks consists of three 

 specimens of dolerite from the great sill at the Horn Bluff, King George Land. Other 

 dolerite types related to that of the Horn Bluff sill were collected as erratics along the 

 coasl of Adelie Land, notably at Cape Denison, where the main collection of the 



Kxpnlition \\iis made. 



At the Horn Bluff the great sill, intrusive into a sandstone formation, rises in 

 organ-pipe formation as gigantic cliffs upwards of five hundred feet in height. The 

 specimens from this important locality were collected by C. T. Madigan's party. 



