66 J. T. Juttion: 



garded as Kalimnan. The overlying basalt at Greensborough and 

 that at Ivanhoe must therefore be Kalimnan or younger, but it is 

 uncertain whether the Mt. Cooper basalt belongs to the same series 

 or to the Newer Basalt period. 



The Kangaroo Ground sediments and covering basalt are on a 

 balance of probabilities provisionally placed with the similar rocks 

 of Greensborough. 



The evidence therefore shows a series of basaltic outliers, which 

 point to a distinct period of vulcanicity between the typical Older 

 Basalt of Royal Park and the Saltwater River, and the Newer 

 Basalt of the plains, the intermediate period being separated from 

 each of the others by a great time gap. It is suggested that the 

 terms Older Basalt and Newer Basalt be retained for the rocks above 

 indicated by those names, as they are now well established and 

 understood, whilst the term Intermediate Basalt be used for the 

 basalts of the intermediate period. 



On the above reading, the Kangaroo Ground and other basalts 

 cannot be considered as monadnocks on the Nillumbik Peneplain, 

 as they are younger than such peneplain. 



Garden Hill at Kangaroo Ground may l)e a worn-down vent of 

 the Intermediate Basalt. 



From the physiography of the district it is inferred that the 

 Intermediate Basalt was poured out bcfon- or shortly after the 

 uplift of the Nillumbik Peneplain. 



In conclusion, it is well to state that the want of definite con- 

 clusions on the various points raised in this paper is chiefly due to 

 two i-easons — first, the unsatisfactory character of the evidence 

 itself, and second, the incomplete examination of the ground by 

 the writer on account of his removal from Victoria to Western 

 Australia. 



Sufficient data have, however, been brought forward to show that 

 not only a thorough investigation from all points of view of the 

 basalts and associated sediments of the area dealt with in this paper 

 and of adjacent districts is required, l)ut also that the Older 

 Basalts of the State as a whole should be subjected to a close re- 

 examination ?\s opportunity offers. 



The difficulties atteiiding attempts to fix tlir age and stratigra- 

 phical relations of the Victoi-ian liasalts have Ik'ch jioiiited out liy 

 Prof. Skeats.i 



1 Pres. Add. (Sec. C), A.A.A.S., IJii.sliain^. liUlii, )i. 



