Physiogra'phy of Yarra, etc. 505 



At the south-western end of the basalt, and just south of the 

 main road, a sharp cone of sihirian rocks rises some height 

 above the peneplain. It is also higher than the basalt 

 abutting, but the latter is somewhat denuded here. This hill 

 is also a monadnock. 



Lily dale Basalf, <iii.d (JiKtrtzites. 



These are apparently monadnocks on the Nillumbik Pene- 

 plain, which is here in the Croydon fcienkungsfeld ; but they 

 have not been sufficiently examined to be adequately discussed. 



W arramate Hills. 



These occur about two miles to the nort-west of Killara 

 railway station. They are marked on the parish map of 

 Cruyere. The two chief hills are Briarty's Hill (an old Trig, 

 .station) and Steel's Hill. 



At Killara the Wandin Yallock Creek enters the wide flats 

 through which the Woori Yallock Creek and Yarra River wind 

 towards Healesville. West of Killara the Wandin Yallock 

 Creek is in a compai'atively narrow valley, with well-defined 

 sides. From the top of this valley the country is seen stretch- 

 ing away to the south-east, south and west as a fairly even, 

 but dissected surface. ^ From this surface a ridge runs north- 

 ward, steadily rising, and stretches out as an elevated tongue 

 bounded on the north, east and west by much lower land. This 

 ridge forms the Warramate Hills. At Briarty's Hill the ridge 

 rises rather abruptly, the height of this hill being according 

 to an aneroid reading about 1400 feet above sea-level, and 

 about 1100 feet above the alluvial flats at Killara. A little 

 to the north of Briarty's Hill is Steel's Hill, which does not 

 appear to be so high, and from Steel's Hill there is apparently 

 an abrupt descent. The Warramate Hills form a prominent 

 feature in the landscape from various points of view. 



The exposed rocks of Briarty's Hill are moderately tough 

 sandstones, with abundant quartz in parts. There seems no 

 reason why they should specially resist denudation, so as to 



1 Whether this surface is part of the Nilhiinbik I'etieplaiii, or not, I cannot say, as its 

 relations have not been determined. 



