Geology of tli<- I'io imnnl Creek A'rea. 325 



Ml-. Dunn.l in 1905, visited the L'liioii Mine, Diainoiid Cieeii. 

 In liis report lie mentioned the northerly pitch of the country and 

 of the shoots of gold. He stated also that the (piartz veins were 

 filling couitruction fissures in the dyke, and that payable gold wimid 

 prol)ably be localised near the intersection of the ff)ot\vall reef 

 with certain bands of the country rock. Two sections illustrat- 

 ing the relations of the dyke, breccia and ([uartz reefs with the 

 Silurian, accompany the report. 



J. T. Jutson,2 in a papei' read before this Society ini l!)Ul). de- 

 scribed very fully the physiographii' characters of the Plenty liiver. 

 The present valley of the Plenty, south from Morang. is 

 described as a young stream wliich has eaten its way back toAvards 

 the old Plenty River near Morang. A tongue of newer basalt filled 

 up this valley to near Greensl)orough, and the present valley was 

 cai-ved out near the junction of the neAver l)asalt with th.- older 

 rocks. 



J. T. Jutson,-^ in an excellent jihysiographic papiT on <lie liistoiy 

 of tlie Yai'ra Tviver and Dandenoug Creek basins, has desi-iibed the 

 Nillunibik pfiu'plain, and lie has shown that the Yarra River in its 

 course through the Warraiidytv' gorge is ;i revived antvceih'nt 

 stream. 



The age of the Nilhim])ik penepbiin is diseussed. and he shows 

 that the age is probably kalinmaii, and that uplift prolial)ly dates 

 from late kalimnau, and has continued to A'ery recent times. 



. In 1910 Jutson* described the interesting Warrandyte goldfield. 

 The Silurian sediments are described, and the main folds mapped. 

 The probable age of the series is discussed, and he states that the 

 oldest beds are jjrobably at Warrandyte, and the youngest in the 

 BuUeen syncline, and that the beds near the Diamond Creek are 

 intermediate in age. 



3. — Physiogpaphy. 



The area is part of Avhat has been called the Nillumbik pene- 

 plain.-' The average elevation is betAAeen 300 and 400 feet, and 

 tlie highest point is at (harden Hill. Kangaroo Grounds, Avhich is 



1 K. .1. Diinii. The I iiion Mine. IHaiuoiid f!rc-ek. Kw. Vict. (Jeol. Surv., vol. ii., 1907-1008, 

 \<\\ 3:!-3:-.. 



2 J. T. Jutsoii. A coiitributioii to tlie plivsioal Jii>toiv of the rieiity Ktver, ete. Hroc. l!oy. Soc. 

 Vict., vol. xxii., I't. II., (U.S.). 190>». 



3 .1. T. Jutsoii. I'livsioiT. of the \';iii-a livei-, etc. I'roc. Kov. Soc. Vict,, vol. .\xiii., (n.s.), 

 Pt. II., 1911. 



4 J. T. Jutsoii. The structiual and jjciieial geoloyy of the Wiinaiidyte gold field and adjacent 

 country. Proc. Roy. Soc. A'ict., vol. xxiii., Pt. II., 1911. 



For pur]K)se-^ of reference we shall call these papers by .hitson, a, h, e, respectively, 

 u .Jntsoii. h, |>. 477. 



