98 Proceedings of the Royal Societi/ of Victoria. 



Beds 15 and 17. Gault, 30 ft. Thick. 



These deposits of very fine bluish calcareous dny, must 

 probably have been laid down in comparatively deep water, 

 as the material is so fine that it would settle very slowly ; 

 it seems to represent the rainwash of a large area covered 

 with chalk. 



Chalk beds, of Eocene age, cover large portions of the 

 South Western corner of Victoria, and in the past they must 

 have been much more extensively outspread. The water- 

 courses have removed large quantities of this rock, and 

 mingled with clay derived from the abundant lava beds, the 

 sediment has been discharged into the sea. 



Taking into consideration the nature of the various beds 

 shown in the bore, I think that they indicate a coast line 

 Avhich has been repeatedly shifted throughout the Tertiary. 

 It would be a good thing to have this bore carried down, at 

 least until the Secondary rocks were met with, for it is a 

 fair presumption that the Tertiaries lie immediately upon an 

 eroded extension of the Jurassic rocks of the Otway District. 



The Warrnambool Strata as Reservoirs of Artesian 

 Waters. 



The economic value of the boring operations deserves some 

 consideration. The Wari-nambool strata extend to the North 

 in fiat sheets, which rise in that direction at a rate of 35 feet 

 in the mile, and which thin out against the Paleozoic hills at 

 gradually increasing altitudes. 



At Hexham, 30 miles distant, almost due North, the 

 Hopkins, descending from the hills, at an altitude of 432 feet 

 cuts its bed through Silnrian rock first, then it enters the 

 Tertiary limestones and sandstones which enwrap the older 

 rocks, and which are the inland extensions of the rocks in 

 the bore ; and lastly it cuts into the lava which covers up 

 the limestones. 



On the North East, at Camperdown, these Tertiary beds 

 rise to about 540 feet above sea level. They reach 731 feet 

 at Penshurst, and 640 feet near Hamilton. 



Thus the beds of the upraised Tertiary sea have a regular 

 dip to the South. Fifty miles inland they are found at an 

 altitude of 700 feet, whilst at Warrnambool where they have 

 been pierced, they are 240 feet below sea level, or on a fall 

 of over 1000 feet in that distance. The beds themselves 



