262 Charles Fenner : 



and Darriwill (1700 feet), while the less known are Ingliston, Hvde- 

 well, and ** llae's Hill " The heights given will be noted to much 

 •exceed th^ last -described group of hills, the difference being due, of 

 course, to the positions of these points of eruption on the relatively 

 lifted block of the ** Ballarat Plateau." 



Larkin's (U" Bald Hill is a siuall liill, but owes its greater eleva- 

 tion to the fact that it stands above the Greendale Fault line, just 

 within the timbered country. It is a cinder cone, with the latest 

 breach to the north-west, the lava from this point assisted in form- 

 ing the newer basalt tongue which flows across the fault line near 

 by. (See Fig. 8.) 



Steiglitz is quite treeless and is a low rounded dome with no 

 sign of a crater. Large erupted blocks occur on its summit and 

 slopes, and it has also been the point of origin of a good deal of 

 lava. Gorong is a wooded hill, very scoriaceous, and the northern 

 iind western slopes show successive outcropping steps of lava, giving 

 it a peculiar terraced appearance. Darriwill is closely similar 

 to Gorong, and it would not appear that either volcano had ever 

 been greatly effusive. Ingliston is a very small hill, north of the 

 Ingliston railway station. The particular interest of " Rae's Hill," 

 which occurs on " Highton," near Greendale, is its insignificance 

 as a landscape feature. It is an undoubted point of eruptioh, and 

 yet its elevation above the general level of its flow is only to be 

 noted by close observation. Finally, we come to Mount Hydewell, 

 in many ways one of the most interesting of the group with which 

 we are now dealing. It lies something over a mile south of Ballan, 

 and has a grade so gentle as to be almost imperceptible; yet there 

 seems no doubt that from the point of view of lava production, it 

 is the most important volcano in the district. There is some very 

 vesicular material about the top of tlie rise, but it would appear to 

 have had very little explosive activity, and hence did not build a 

 cone. This is evidently the point referred to by Mr. Hart (ref. 

 22), a.s " an unnamed centre near Ballan," Small streams flow 

 from Mount Hydewell : — 



N. and E. to the Werribee River. 



E. and S. to the Parwan and Yaloak Creeks. 



S. to a swampy area near Mt. Wallace. 



W. and S.W. to the Moorabool River. 



It probably had a very big destructive effect on the old physio- 

 graphy here and undoubtedly exercised great influence in the loca- 

 tion of the present river channels. 



