346 



Particulars of the Strata passed through in the Company's 

 No. 4 Bore (Manunda Creek): — 



Nature of Thickness in Depth from 



Strata. feet, surface in feet. 



Red OJav 40 40 



Yellow Clav 20 60 



Sand 100 160 



Sand 138 298 



Sands with Shells (water) 2 300 



Sandy Clav 18 318 



Black Clay .•••.••• '^ 325 

 Dark-brown Clay with Pipe- 

 clay ... ... ... 50 375 



Light - coloured Brownish 



Olay with Pipeclay ... 35 410 



Full depth of Bore, 410 ieet. 



Remarks on the above Sections. 



Both the borings dealt with in this paper penetrated the 

 fossiliferous marine beds, which are co-genetic with the fossili- . 

 ferous Lower Cainozoic series of the Murray Plains, Gulf St. 

 Vincent, and other localities in the southern portions of 

 Australia. Their occurrence near Lilydale is of considerable 

 interest as being the most northerly locality known for these 

 beds in South Australia. As far back as 1876 beds of the 

 same age were proved in a Government well that was sunk in 

 a position about half-way between the Burra and the Nor'- 

 west Bend of the River Murray — a distance of about thirty 

 miles from either place. It is highly probable that, although 

 obscured by a thick covering of recent sediments, the beds are 

 continuous from Lilydale to the Murray Plains. 



The locality where the bores are situated is evidently near 

 the north-western limits of the marine series, as Mr. Ward 

 informs me that "there is an outcrop of Cambrian slates in a 

 wash-out beside the road, about three miles north of Lilydale 

 station." It is possible, however, that, as the beds have 

 undergone great denudation in the district, they may have 

 originally transgressed the platform of older rocks much 

 further to the north and west than their present limits. 



From the particulars supplied, it is not quite clear as to 

 the exact thickness of the marine beds in the two bores. In 

 the Kruger Dam Bore blue clay with shells is recorded from 

 the depths 360 feet to 374 feet, but it is possible that the blue 

 clay noted from 198 feet to 360 feet may belong to the same 

 marine series, and, if so, the thickness of the beds may amount 

 to 76 feet. In No. 4 Bore the fossiliferous samples supplied 

 to me included depths from 298 feet to 325 feet, or a thickness 

 of 27 feet. 



