G>'<)lo<i,i of f/ihiihih'. .'559 



XXX., Fig. 2), and also, if we regard it as continued to the Yairu, 

 in the two marshy areas above i-eferred to. The theory that it is 

 a normal junction, though satisfactory for section CD, across the 

 Fault Valley above referred to, appears to be inconsi.stent with 

 seetioii AH. wluMf tlie valley is iidt brdinl. but deep and nari'ow, 

 the junction Ijeing neaily vt-rtirnl. 'i'lie fault tlieory is therefore 

 supported, not only l)y the persistence of dii(.'(.tion, and the evi- 

 dence of depression on the western side, bot also by the nature of 

 this valley, which 1 have theiefore tailed the " Evelyn Fault 

 Valley." 



The downthrow of this fault would be, of course,, on the west, 

 where the younger rocks are in every case preserved. 



Taking the combined high probabilities of the Montrose, and the 

 Evelyn faults, it is difficult to avoid the conclusion that a large 

 rectangular block, including at least the northern part of the Dan- 

 •denong mountains, has foundei-ed lietween these two fault planes. 

 (Plate XXX.. Figs. 1 and .'5.) 



Some six months after I had mapped the northern part of the 

 Montrose fault, Mr. J. T. Jutson published, his valuable paper on 

 the Physiography of the Yarra (18). He postidates. though, with 

 a query, what he calls the Dandenong fault, running along the 

 western edge of the Dandenong Range, in the path of the Montrose 

 fault, and continuous in the south with the faidt discovered by 

 Sir A. R. C. Selwyn, near Frankston (18). He also coiitinues the 

 Brushby Creek fault southwards in the same manner. Between 

 these two fault planes, he believes, a bloek has lieen relatively de- 

 pressed, producing in the South the Carrum Swamp, and. a por- 

 tion of Port Phillip, and in the north, the Croydon Senkungsfeld. 



The fresh evidence educed in this paper points to the need ot' 

 certain modifications of this theory : — 



The Croydon Senkungsfeld has been relatively depressed, as he 

 says, against the Brushy ('reek fault scarp, but not against the 

 Dandenong Mountains. On the contrary, if the senkungsfeld ex- 

 tends so far eavst, then the Dandenongs have been faulted dowii 

 against the senkungfeld. Since the relative depression occurred, in^r 

 on the west of the fault plane, as Mr. Jutson has postulated, bu' 

 on the east, the Dandenongs possess their present height, not be- 

 ■cause of these dislocations, but in spite of them. For this reason 

 I am unable to agree with Mr. Jutson 's theory of a Dandenong 

 fault, forming the eastern boundary of the (^-oydon Senkungsfeld. 



Seeing that there is very prol)ably at least one fault (Monti-ose 

 fault), coasting the western wall of the Dandenongs. it remains to 



