16 Proceedings of the Royal Society of Victoria. 



occurs at a lower level than do the gastropod beds, though 

 the actual contact cannot be seen. In South Australia, also, 

 Professor Tate* states that the polyzoal I'ock is the older of 

 these two members of the series. The evidence we have 

 adduced shows that in this locality as well, the sequence of 

 the beds, as might have been expected, is similar. The 

 deposit at Orphanage Hill, and consequently its extension 

 up the valley of the i-iver is usually spoken of as Oligocene, 

 though coloured Miocene in the quarter-sheet ; while the 

 Waurn Ponds rock, which, like the Batesford limestone, is 

 true polyzoal rock, is called miocene. This is, however, a 

 reversal of the true sequence, for the limestone is undoubt- 

 edly the underlying member of the series. In his exhaustive 

 examination of the Muddy Creek beds, Mr. Dennantf states 

 that the whole series must be referred to eocene age, and the 

 list of fossils we give, shows that no very marked difference 

 if any at all exists between the ages of the gastropodous 

 clays in the two localities. 



Other Tertiary Deposits. 



We paid but little attention to the other tertiary 

 deposits. The basalt capping the hills is a portion of 

 the extensive flow of our western plains. The source 

 of the rock is not apparent at any rate in the immediate 

 neighbourhood. 



The river valley is covered in most places by drift, varj'ing 

 from fine sand to coarse gravel, consisting principall}' of 

 quartz. Near Madden's, some greenstone pebbles were 

 obtained, resembling those of the Barwon drift, both above 

 and below the junction with the Moorabool. In the case of 

 the former stream, they are probably derived from the gabbro 

 outcrop, marked on the survey map as occurring about six 

 miles above the junction ; but the origin of the pebbles in 

 the Moorabool is not clear. The drift is marked on the 

 geological map as being of pliocene age. 



Our thanks are due to Mr. J. Dennant, F.G.S., F.C.S., &c., 

 for his kind assistance in the identification of many of the 

 fossils. 



* " Trans. Roy. Soc. S. Aust,.," 1884. 



t" Trans. Roy. Soc. S. Aust.," 1888, and " Proc. A. A. A. S.,"' loc. cit. 

 See also " Trans. Roy. Soc. Vict.," 1891, p. iVd. 



