Physiography of Werribee Area, 



227 



f 



^aay 







Scale.L 



h% 



% 



V.L-100' 



MILES. 



^ m 



Ordovkian. 



Siates.&c. 



Permo-Carb. 



Glacial S'Stoncl 



Old«.r 

 Basalts 



V V V 

 V V 



V V V 



Mid-T«rt.(1) 

 Sands ^Groveb. 



Newer 

 Basalts 



Recent 

 Alluvium. 



Fig. 8.— Plan of portion of the Greendale scarp, extending from 

 Larkin's or Bald Hill in the west to beyond Greendale, showing- 

 100-foot contours and g-eneral geology. The lines of the sections 

 shown in Figure 9 are indicated. F — Fault. 



The total length of the Greendale scarp is about eighteen miles. 

 Fig. 8, with 100 feet contours taken from the maps of the Military 

 Survey, shows also the geology of a large portion of this scarp. 

 The evidence both physiographic and geological, is closely parallel 

 to that of the Rowsley Fault. There is a varied area of hill, 

 valley, and plain on the lower block B (referred to also as 

 the Ballan sunkland), of an average elevation of 1500 feet. North 

 of the scarp the average elevation is over 2000 feet; the transition 

 from the lower to the higher level is usually abrupt, as shown in the 

 sections which will be referred to. The scarp runs generally a 

 few degrees south of east, turning to south-east beyond Mt. Black- 

 wood. The line of the scarp is not straight, but this is quite in 

 accord with the general charactei-istics of faults. As stated by 

 Professor W. M. Davis (ref. 16) : — " The fault may be nearly a 

 plane or a conspicuously curved surface, but from all that is known 

 of faults, it cannot possess sharp or exaggerated irregularities such 

 vas are seen in the septa of an ammonite. '* 



