222 Proceedings of the Royal Society of Victoria. 



cation is adopted by Murray (7). We have elsewhere (19) 

 given reasons for considering them to be very early Eocene or 

 Cretaceous. 



The Older- Volcanic. 



We have elsewhere shown that the age of these rocks is Eocene 

 (17). The area covered can be seen on referring to the quarter- 

 sheets, the outcrops being confined to the central and north- 

 western part of the district under consideration. 



At Mentone a bore for water was put down which is stated to 

 have reached Silurian at a depth of 5<S3ft. No basalt was found 

 in the bore. Fossils occurred at 86ft.; 150ft.; 235ft.; 253ft.; 

 but none were preserved. We have to thank Mr. G. D. Barker, 

 for the particulars. 



At Mordialloc another bore put down for the same purpose in 

 1887 reached basalt at 223ft., and it was bored into for a 

 distance of 17ft. when operations were suspended. 



At Frankston again the Volcanic Rock was struck under 

 tertiaries at a depth of 250ft. (4). It covers a large part of the 

 Mornington Peninsula, and the country to the eastward. 



Marine Eocene. 



The evidence put forward in the present paper shows that we 

 may consider the following beds as Eocene — the grey clays and 

 limestone of Altona Bay and Newport, the polyzoal limestone 

 and the ferruginous beds indicated at Keilor, the lower beds at 

 Royal Park and those facing them at Flemington, lower beds at 

 South Yarra, ? Windsor, and the unknown beds from which the 

 limestone shingle of the Beaumaris Beach is derived. The 

 deposits at Altona Bay and Newport were unknown to the old 

 survey, while the others were, with perhaps the exception of the 

 polyzoal rock at Keilor, which was merely classed as Tertiary, 

 grouped with the other ferruginous beds as Pliocene. The 

 Eocene beds of Royal Park, Flemington and Green Gully are 

 evidently littoral, while the liner nature of the sediment, and the 

 great abundance of sponge spicules in the deposits at Altona Bay 

 suggest deposition in deeper water. 



