206 Proceedings of the Royal Society of Victoria. 



16. Domain Boad, South Yarra. 



A shaft sunk during the progress of the sewerage works near 

 the Grammar School Chapel, yielded casts of a few gastropods, 

 a small bivalve, some polyzoa and foraminifera. We were unable 

 to determine any of the specimens. The depth at which they 

 were struck was about twenty feet below the level of the South 

 Yarra Railway line, judging by the plans kindly shown us by 

 the overseer of the works. A drab tenacious clay occurred 

 below the ferruginous beds, but did not appear to contain fossils. 

 The sewer itself was driven in Silurian. 



17. Royal Park. 



The Railway Cutting in Royal Park, close to Flemington 

 Bridge, is, from a geological point of view, one of the most 

 interesting and instructive spots in the neighbourhood of 

 Melbourne. At the south-western end beneath the semaphore 

 at the level of the rails is a small exposure of the lowest rocks 

 to be seen in the district, the Upper Silurian. When the 

 cutting was new and the exposure fresh, the bedding planes 

 were distinctly visible, although at the present time the nature 

 of the rock is not so manifest. Flanking this ridge on its 

 south-western side is the older volcanic rock. This is deeply 

 eroded and two or three other exposures of it weathered to a 

 soft, wackenitic clay, are visible in the cutting. In the hollows 

 of its upper surface are pockets of sand and clay. The largest 

 exposure of these rests in its lower part on the north-eastern 

 flank of the Silurian ridge just mentioned and thins out on the 

 volcanic rock. Immediately over the thin sheets of white sand 

 and clay there is a bed about a foot in thickness of similar 

 material cemented with oxide of iron mainly in the form of red 

 ochre, which in places passes into hard hematite. 



This band is not separable from the clays and sands on which 

 it rests. The cement penetrates the lower layers irregularly 

 so that at first sight an unconformity suggests itself. This 

 appearance is, however, entirely due to the irregular occurrence 

 of the cementing material. The absence of the cement from the 

 underlying beds may be due to one of two causes. If the iron 

 were ever in the beds it may have been removed by the percola- 

 tion of meteoric water slowing draining along the old channel 



