502 /. T. Jutson: 



place. Some favourable local circumstances may have brought 

 this about. 



Again, the elevation of the land in the Upper Yarra district 

 was, as we have seen, very slow. This no doubt also applied 

 to the land forming the area now under discussion, and if so, 

 then Gardiner's Creek and its tributaries may be antecedent 

 streams, but their directions do not appear normal under 

 any circumstances. 



We thus see that the question has at present to be left an 

 open one. A more detailed examination of the country than 

 the writer has been able to make might throAv further light on 

 the matter, and it is with this idea that the various possibili- 



IVl on ad nocks. 



Scattered about on the Nillumbik Peneplain are various hills 

 rising above the general level of the peneplain. These repre- 

 sent the unplaned portions of the latter, and to them Prof. W. 

 M. Davis has given the name monadnocks. The following 

 have been recognised by the writer. There are other possible 

 ones which I have not yet examined, and in addition there 

 are no doubt further ones in country which I have not yet 

 traversed. Some of the outlines of these forms are drawn on 

 an accompanying plate. 



Morang Hills. 



These have been referred to in the writer's paper on the 

 Plenty River (6, pp. 164 and 167). They were there suggested 

 as a monadnock, and from further observations there appears 

 to be no doubt that they form a true monadnock. Their pre- 

 servation is due to the core of granite, and the indurated 

 sedimentary rocks surrounding the granite. 



Sugar Loaf Hill {Mont Park), near Heidelberg. 



• This is a small hill with its longer axis running north and 

 south. It has a slightly greater elevation than the surround- 

 ing peneplain, and its projection is clearly due to the very 



