Phyniog rai^hij of Werribee Area, 291 



basalt" series, there is no proof that this is the case; the amount 

 -of dissection and decomposition rather favour a greater age in 

 many .cases, but as already pointed out, such evidence is by no 

 means conclusive. 



West of Ballan, near Bradshaw's railway station, there was an 

 old shallow east-flowing valley. This will no doubt be important 

 when read in conjunction with what evidence the Moorabool gorges 

 have to show, but alone it does not help our discussion. 



At A, Fig. 35, we have a basalt tongue mai'king a buried 

 valley, down which a deep and large stream flowed south. We may 

 call it the Ancient Korweinguboora, since its territory is now 

 drained by a creek of that name. This valley has also been proved 

 by bores, just below the line of the Greendale fault. It had a 

 south-easterly trend, but Ave do not know where it went beyond that 

 part of its course shown in Fig. 35. The buried river valleys are 

 in each case; marked by a broken line of arrows in that figure. 



At B, (Fig. 35), a small tributary of the Korjamumnip, the 

 ancient Green Hills Creek, is also preserved under a newer basalt 

 flow. These buried gravels were worked for gold, with much 

 success. 



At C (Fig. 35) we have the valley, ol the ancient Myrniong, filled 

 by basalt, and already frequently referred' to. There are no doubts 

 as to the existence and direction of this old valley as far as the 

 village of Myrniong. (See also Fig 21.) Beyond that our second 

 method will be applied. 



At D (Fig. 35) there is a, small cap of basalt on Trig. Hill. It 

 overlies waterworn gravels, and there appears to be a definite slope 

 in its lower contact line. It is suggested that this basaltic cap 

 marks the site of a small tributary valley that once flowed south- 

 easterly through that point. 



At E (Fig. 35) there is a long tongue of basalt reaching up to 

 Bald Hill. It crosses the Werribee at a low level, and has already 

 been referred to. It is underlain by waterworn gravels, and the 

 writer believes it marks a south-flowing tributary. The present 

 arrangement of the basalts of the locality suggests that, while the 

 Trig Hill capping now stands about 400 feet higher, in pre-fault 

 times the liasalt may have simultaneously extended up the two 

 valleys. 



At F (Fig. 35) we have the ancient Bullengarook Treek. with its 

 suggested southern continuation, while at G we have important 

 evidence of a slightly different nature. At this point wo are a}>ove 

 ihe scarp, on that pait of tlie plateau vhcre the Mell>()urnc-l^allarat 



