RIVER YARRA, VICTORIA 35 
largely recognized from the residuals of the lava flows that ran 
down them. 
All divides, being elevated above the surrounding country, are 
subject to strong attack by subaerial erosion. Thus the divides of 
Oligocene times, having withstood erosion from then till now, will 
be much reduced and not so readily recognizable. Fig. 6 shows 
the reconstructed divides, and the river system, ancestral to the 
Yarra, which it is believed was in existence in early Tertiary times. 
The following are the divides which concern the present paper: 
22 
ох 
SN) 
WURUNJERRI R^ 
СЕСЕ 
МУ 
NS 
SSSR SSSR 
ALME 
SSS 
Hg 
ANN 
K 
N 
LEN, 
MELBOURNE 
SK 
2 
CAPE SCHANCH 
STRAIT 
FIG. 6 
aeogeography of the river system in early 
et ancestral to the Yarra River 
hed represent Older Basalt outcrops. 
i-di i 1 
es Basalt). times 
system. The areas eross-hate 
Mt. Arthur-Dandenongs Divide. This stretches from Mt. 
aS through Mt. Martha, Mt. Eliza, Lysterfield Hills (all of 
these are of granitie rocks) to the Dandenong Ranges (Upper 
