PltysiograpJiy of Werrlhee Area. 261 



creek on the west have carved their valleys back, stripping off the 

 basalt, and in places laying bare the ancient river gravels. A 

 little to the east of BuUengarook is the lower hill (also volcanic) of 

 Little BuUengarook. They stand on the ridge which forms the 

 divide between the Werribee and the Gisborne Creek. An older 

 spelling of the name was BuUancrook. 



(d) Mt. Gisbor7ie and (its neighbours. — Mount Gisborne (2105 

 feet). This is a similar volcanic hill, but much more irregular in 

 outline than those already described; it would appear to have pro- 

 duced more extensive lava flows than the hills dealt with 

 above. Although not so high as BuUengarook, Gisborne is the 

 dominating feature of the east-west ridge that forms the divide 

 between the Werribee and Saltwater basins at this place. To 

 the east and south-east, volcanic hills are numerous, and among 

 them may be mentioned Mounts Aitkin (1644 feet). Red Rock (1640 

 feet), Holden (1360 feet), and Kororoit (779 feet). 



(e) The -Ana kies.— Mention has already been made of the 

 Anakies, and little remains to be added here. The volcanic portion 

 of the group comprises three high, treeless, volcanic hills, the most 

 important of which is close against the Rowsley Scarp. Between 

 that hill and the scarp the Anakie Creek has cut its valley, the 

 upper part of which has probably been captured by the Little 

 River. The highest of the volcanic domes is called Mt. Anakie 

 (1350 feet). It is by far the largest single volcanic hill in this 

 area. 



(f) Volcanoes of the Lower Plains. — Here we have a series of 

 well-known hills. They include Bald HiU (731 feet). Spring HiU 

 (700 feet), Mt. CotteriU (669 feet), Mt. Mary or Green Hill (476 

 feet), Mt. Atkinson (459 feet), and other lower points of eruption. 

 Mt. CotteriU has a most characteristic shape, and may- be easily 

 recognised from a distance on account of its peculiar flat top. Mt. 

 Mary is well known as a breached crater (Gregory, ref. 20), and 

 also possesses interesting geological features very fully described by 

 Kitson (ref. 37). North of Spring Hill, at Nerowie, there are 

 two large natural, basins — the northern and larger one being a com- 

 plete basin, while the one to the south has an outlet; both are cul- 

 tivated. They undoubtedly represent well-preserved volcanic 

 craters, possibly enlarged by subsidence. 



(g) Volcanoes about Ballan. — Here again wo have a number of 

 hills, whose outlines in most cases are familiar to travellers between 

 Ballarat and Melbourne. The better known ones include Larkin's 

 or Bald Hill (2300 feet), Steiglitz (2000 feet), Gorong (1800 feet), 



19 



