272 T. S Hart: 



tions and tilting- there may be more than one east and Ave«t 

 crest produced. This would explain the character of the drainage 

 system initiated in the Ballarat area, Mt. Doran, if previously 

 formed, helping somewhat to constitute the southern crest. 

 From the high land before mentioned running from east of Cres- 

 wick to beyond Buninyong there seems to be a general fall to 

 the Avest. Much of this may be due tO' the later denudation, 

 but it is not unlikely that a fault exists under the Ascot Gap or 

 at least a line of an original minimum elevation. A fault might 

 have contributed to the preservation of the small patch of 

 glacial rocks known to exist at the Midas Mines. 



That east and west crests would be ait first produced might 

 be expected from the general trend of the Mesozoic trough, the 

 tertiary trough and Bass Strait, all of which may be regarded as 

 a series indicating a prominence of movements on east and 

 west fractures since the time at which the active folding of the 

 older rocks ceased. 



Some of the faults suggested may seem to have little to sup- 

 port them, but I think there is sufficient evidence to sum up 

 the character of our western highland and Divide as due to 

 unequal block elevations of a Mesozoic or early Tertiarv pene- 

 plain, with subsequent extensive modification by denudation 

 and volcanic activity. 



DESCRIPTION OF PLATES XXII.-XXVI. 



Fig. 1. The Main Divide and some of the transverse i-idges, from 

 near Lexton westwards, compiled from various sources. The 

 names of the principal north flowing streams are shown. The 

 south slope, except close to the Serra Range, drains eventually 

 to the Hfipkins. The numbers indicate hills as follows: — 1, Mt. 

 Ararat; 2, Larne Gerin ; 3, Mt. Buangor ; 4. Ben Xevis ; 5, 

 Sugarloaf ; 6, Avoca Hill ; 7, Ben More ; 8, Ben Major ; 9, Mt. 

 William, a is the gap by which the railway goes from Ararat 

 to Stawell ; at h the Ararat-Avoca railway crosses the Divide; 

 and at c passes from the Wimmera to the Avoca valley. The 

 Main Divide is indicated by a broken line. 



Fig. 2. Hills on and near the Divide at the Ercildouu and Ascot 

 Gaps. indicates Ordovician amd G granitic artxis. The full 



