Art. III. — Xofes on the Lower Tertiaries of the Southern 

 Portion of tJte Moorahool Valley. 



(With Plates III and IV.) 



By T. S. Hall, M.A., and G. B. Pritchard. 



[Read March 5, 1891.] 



The occasion of the visit of the University Science Ckil) 

 to Geelong for their long-vacation trip enabled us to make 

 some observations on the geology of tliis locality. 



The course of the stream, from its sources to the eastward 

 of Mount WaiTenheJp down to its junction with the Barwon 

 at Fyansford, neai- Geelong, is across the eastern portion of 

 tlie great volcanic plain of South Western Victoria. Like 

 most of our streams flowing through basaltic country, it h;is 

 cut a deep and narrow valley of its own, and has in many 

 places exj)Osed the underlying deposits. In the upper 

 part ot its course, these underlying deposits are of lower 

 Silurian age, while in its lowei- part they consist of tertiary 

 strata. 



Our observations dealt principally with the older tertiary 

 deposits, and extended from the railway viaduct, near 

 Batesford, down to the junction of the stream with the 

 Barwon at Fyansford. 



Granite. 



Tiie oldest rock exposed is the granite, an outcrop of 

 which, about a square mile in extent, occurs at the Dog-rocks 

 near Batesford. Another outci'op, a few yards in extent, 

 occurs where the Maude Road crosses Sutlierland's Creek at 

 Darriwill, ten miles from Geelong ; and probably granite 

 occurs at no great depth beneath the surface everywhere 

 between the Dog-rocks and the granite hills of the You 

 Yan^s. 



