t>2 W. R. BROWNE. 



the stream that subsequently came into existence. The 

 author has personally observed instances where the course 

 of the Lower Hunter is determined by fault planes bringing 

 Permo-Oarboniferous sediments and Carboniferous lavas 

 into juxtaposition, and where the stream winds in con- 

 formity with the hard lower or kernel strata of the 

 Lochinvar anticline; an! one tributary valley at least, 

 strongly suggests, on stratigraphical grounds, a formation 

 by trough-faulting. 



Where such actual dependence of stream course on geo- 

 logical structure can be demonstrated, and where the 

 possibilities for further such dependence exist, it seems 

 that careful examination of all the apparent anomalies of 

 behaviour of the Hunter tributaries should be made before 

 the hypothesis of river capture and breached divide, with 

 all that it implies, is finally accepted. 



