Highltmcls of Western Victoria. 'J 07 



Pitch certainly influences details of hill and clifif shapes 

 especially when combined with steep dip joints at right angles to 

 the pitch. Examples of this are found at the Werribee Gorge and 

 at Bendigo. 



If crossfolding determined the original crests of the elevating 

 plain, it must have been a. cross folding produced concurrently 

 with the elevation, aind I think the pitch of our older folded 

 rocks will as a rule be better explained by some cause nearly or 

 quite contemporaneous with the main folding. 



The clue to the cause of the early Divide on the elevating plain 

 is to be found in the movements of elevating and tilting fault 

 blocks. 



The m(jst conspicuous feature of the southern limit of the 

 Victorian highlands is that they terminate at a practically 

 straight line. The restoration on the latest geological map of 

 Victoria of the granitic areas near Mt. Elephant makes this still 

 more evident. It must be remembered that the volcanic area 

 north of these granitic inliers is gradually rising to the north and 

 though not very high at the foot of Mt. Elephant it rises gradual- 

 ly and continuously to the Divide in the Ercildoun Gap. 

 Similarly in Eastern Victoria two straight lines terminate the 

 main mass of the liighlands. Ttese lines are independent of 

 the rock folding, cross various rocks, and arC' no doubt fault 

 lines forming the north limit of a relatively depressed area. 

 Movement on these lines, or near them may have been both 

 pre-tertiary and later. Consequently the comparison of levels 

 on the north and south of these lines does not give a safe 

 ■estimate of the amount of tilting, apart from dislocation, of the 

 peneplain, if such peneplain be regarded as continuing beneath 

 the tertiary areas, or merging in a plain of marine denudatidu. 



It is likely, but not altogether certain, that similar move- 

 mentis had already formed the Mesozoic trough. In Western 

 Victoria it is largely a question of what Mesozoic rocks are 

 i)uried under the tertiary a point Avhich has not yet been in- 

 vestigated. 



At the east edge of the JJallarat Plateau we have the wall at 

 Bacchus Marsh. This does not coincide with the banak of 

 Ordovician rocks against which the glacial rocks rest. Even the 

 importance of that bank may be exaggerated ; it must be kept 



