400 Charles Fenner: 



In the following description prominence is given to block-fault- 

 ing to account for the physiography, and it may be -well to sum up 

 the strong evidence in favour of this. 



(a) Hart has demonstrated ])l(>ck-faulting in the Western Divide 

 .(Grampians, Pyi'enees, etc.); tliese faults run roughly north and 

 .south with the blocks tilted upwaid in the ea.st. and downward in 

 the western part. 



(b) Taylor proves that similar features have played a very 

 imjiortant part in the physiography of South-eastern New South 

 IVales. 



(c) The area under discussion, where closely examined, gives 

 •clear evidence of extensive faulting. 



(d) Slickensides are abundant here, being traceable for 15 miles 

 along one fault line. 



(e) Tlie mapped outline of tlie granite of the southern Strath- 

 bogies is very suggestive. (See (4eol. Map of Vict.). 



The collecting of stratigraphic data to prove this block-faulting 

 would be. with tlie present knowledge of the area concerned, prac- 

 tically an impossibility. It can only be said that the physiographi-: 

 evidence is such as to give rise to the hope that future strati- 

 graphical research here will give a final proof to tlie tlieoi-y of 

 block-faulting. 



We may assume two huge fault-blocks in the area concerned ; one 

 with its high eastern part running north and south in the neigh- 

 bourhood of Mt. Buller. and dipping westward to the base of the 

 next block, whose uptilted edges are indicated by the CerV)eiean 

 and Puzzle Ranges. 



To the sinking of the eastern block may be perhaps attributed the 

 preservation of the lower carboniferous beds of Mansfield, while the 

 only relic of similar beds on the fault-block to the w^est may l:)e the 

 small patch of sandstones and mudstones of the Cathedral Range. 



Fig. 13 is an endeavour to represent the present upper Goulburn 

 Valley as it would appear if it had quietly developed as a western 

 flowing stream, without the interference of crustal changes during 

 its career. A comparison of this figure with the actual upper 

 ■Goulburn (Fig. 16) will be interesting. 



Fig. 16 shows the two northward flowing streams which have Wvw 

 postulated, the eastern one passing through the Barjarg Gap. lioth 

 streams have a tendency to drainage from the eastward, wliich 

 would bo a natural consequence of the tilting of the ))lock. This 

 tendency to receive the chief tributaries from the east is notiifal)le 

 in many of our present northern strenms. 



