382 W. R. BROWNE AND A. B. WALKOM. 



either side, while the steep eastern scarp of the range from 

 Mount Bright to Mount View also betrays youthful physio- 

 graphic conditions. 



Two examples of imminent stream capture on a small 

 scale are to be seen near Matthews' Gap, within a quarter 

 of a mile of one another, where two parallel branches of 

 Moogering Creek are eroding back towards Flying Fox 

 Gully which is flowing at a higher level than the other 

 creeks, in a direction perpendicular to them and with a 

 much gentler grade. A reference to the contour map will 

 make evident the very short distance which remains to be 

 eroded in both cases. 



Faults. 

 Although there is evidence of extensive and complicated 

 faulting very little can be definitely determined with regard 

 to it. This is due to the fact that much of the faulting 

 occurred probably as early as Mesozoic times, so that all 

 surface evidence has long been obliterated, and the exist- 

 ence and position of the faults must be inferred from 

 geological considerations. 



Professor David has determined, on stratigraphical 

 grounds, a series of faults affecting the beds of the Permo- 

 Oarboniferous, and it is quite likely that in connection with 

 these main movements minor faulting occurred in the 

 eruptive rocks of the district. A very marked line of fault- 

 ing is that along the eastern face of the range from Mount 

 Bright to Mount View. In fact two almost parallel faults 

 seem to be indicated here. The evidence is both physio- 

 graphic and geological. The bold scarp of rhyolite, per- 

 pendicular in places, and towering to a height of 600 feet 

 above the plain, is a very marked feature of the landscape, 

 and at once suggests a very recent fault-scarp, while the 

 fact that rhyolites and Permo-Oarboniferous conglomerate 

 are found along the top of the range on its western side, 



