PJiys'uxjrapliij of Yarra, etc,. 485 



that at the foot of the scarp on the low ridge above mentioned. 

 The only feasible explanation is that the \arra here is an 

 antecedent river, tliat its course, when the Nillumbik Pene- 

 plain possessed a generally even surface at its base-level of 

 erosion, was the same as that now occupied by and near the 

 Yering Gorge, and that the uplift of the peneplain and the for- 

 mation of the faults were simultaneous; and yet so slow that 

 in spite of the differential movement tha river held its course, 

 and cut through the higher country as fast as the latter was 

 uplifted. 



Hence the formation of the Yering Gorge as an entrenched 

 meander and the revival of the river. Apart from the gorge, 

 the river occupied the Yarra Senkungsfeld, and so maintained 

 in the depressed area the features of an old river. 



Tlie conformation of the country at the mouth of Brushy 

 Creek also supports this view. It is at this point that the 

 scarps of the Brushy Creek and Yarra Faults meet. The Yarra 

 Fault Scarp here descends steeply, as at the Yering Gorge, to 

 a low ridge. This ridge forms the right side of the Brushy 

 Creek valley, and it is comparable to that described at the 

 Yering Gorge. The top of the scarp is about 200 feet above 

 the ridge, and the latter is about 50 feet above the river. The 

 latter a little above its junction with Brushy Creek is bounded 

 on the right side by the Yai'ra Fault Scarp, and on the left by 

 an alluvial flat. Instead of cutting through the low ridge and 

 thence running south along by the Brushy Creek Fault Scarp, 

 it pierces the Yarra Fault Scarp and its valley becomes a deep 

 gorge. 



Unlike the Yering Gorge, this gorge continues through the 

 Yarra Plateau to Templestowe. 



As Warrandyte is the most central portion of this gorge, it 

 is convenient to refer to it as the Warrandyte Gorge. 



Although antecedent on entering this gorge, it appears doubt- 

 ful whether the course of the Yarra through the Warrandj'te 

 Gorge as a whole is the same as that prior to uplift. Great 

 bends are numerous, and, judged by the maps alone, suggest 

 entrenched meanders. These would be expected on the slow 

 uplift of a meandering stream. Close observation however 

 along the whole length of the gorge shows that these bends 



