122 . AL R. J tinner: 



one. after cro.ssiii|JC the Warruudyte antieline, and that tlie strata: 

 of this fold are ^tratigraphically much inferior to the Yeringian: 

 beds near Yarra Glen. A general interpretation of the structure, 

 therefore, indicates that the beds near Queenstown are superior to> 

 those of the Templestowe anticline, which have been shown by the 

 author in a previous papei- to l)c pi'obably Melbournian or oldei' in 

 age,i and to be inferior to the Yeringian strata occuring to the 

 east of this area. Recapitulating, the age of these beds near 

 Queenstown may l)e regarded tentatively, in the absence of furtlier 

 palaeontological evidence, as either Melbournian or Yeringian ; 

 possibly both series are present in the area described. 



B. — QiKtrt: Diorife, Yoir Yoir. 



On tile sjMir sepai-ating Salter's (tuUv from Yow Yow Gully, and 

 about one and a-half miles east fi-om Queenstown, a rather tough 

 bluish-coloured, holocrystallinc )-ock, composed chiefly of hornblende 

 and felspai-, is seen to outcrop. About the surface, scattered, ex- 

 foliated boulders are present in places, but more frequently, and 

 especially near the noithevn and southern limits of this rock, it is 

 decomposed to a lirownish coloured granular mass. The depth of 

 surface decomposition varies, extending in places to over 150 feet. 



The intrusion is roughly elliptical in plan and the walls, wliere 

 examination was possible, appeared to conform approximately in 

 strike and dip with the surrounding sti-ata. On the surface, the 

 sediments in juxtai>ositioii with the intrusion exhibit very little 

 alteiiiton, and, in fact, the sediments near Queenstcnvn township 

 and Yow Yow Gully away from the intrusion, ai'e much more 

 indurated. Aeconlim: to the District Mining Surveyor,'- ;i tunnel 

 driven in 1S60 fi-om Salter's Gully, passed through a band of 

 hard altered sandstone, rcsendiling basalt, l)efoi-e reaching the 

 diorite. Tliis points undoubtedly to hoi'nfels. l)ut apparently the 

 occurrence of this lock in proximity to the dioiite. is exceptional. 

 In its a])proximate conformity Avith the strata, alisence of marked 

 contact alteration, petrological and chemical charactei'istics. and 

 associated auiifcrous (piart/, veins, the intrusion is very closely 

 allied to the so-calle.l " dyke bulges " of the Wood's Point district. 



CIk iinviil h'chifioHx. — A chemical analysis of a tyj)ical specimen 

 of the diorite fioiii the Caledonia Mine, Yow Vow, was made by 



1 0)>. cit. p. S17. 



•J \'i(k-, .Milling Sniv t-v ors' Hi-ports, ISIiO. 



