1-94 THE GEOLOGY OF THE CANOBOLAS MOUNTAINS. 



regions were being relatively superelevated by the intrusion of 

 laccolites, or expansion of old sediments {e.g., New England, The 

 Blue Mountains). (4) These differential movements led to gentle 

 folding in places; to fresh faulting in oth^r places; in others to 

 further slipping along old fractures. In some localities lavas 

 were expelled. 



In this way an old Tertiary (early Eocene) peneplain, in this 

 case probably the Mole Plain of New England, has been so 

 shifted about, that to-day it occupies widely different levels in 

 different places. Originally it was all as level as the flat country 

 surrounding the Gulf of Carpentaria to-day. 



The correlation of these peneplains, at present a matter of 

 speculation, should prove interesting work for physiographic 

 students. 



EXPLANATION OF PLATES VII. -IX. 



Plate vii. 



Geological Map of the Canobolas Mountains, N.S.W. 



Plate viii. 



Fig.l. — The Orange-Blue Mountains Peneplain in the foreground, with 



the Canobolas Mountains in the distance. 

 Fig. 2. — Upper surface of an andesite-flow in the foreground, with the 



Canobolas Mountains in the distance, 



Plate ix. 

 Part of an andesite-flow — Hopetoun Falls, Canobolas Mountains. 



