62 Froceediv(j>i of fhe Ruyal Society of Victorid.. 



We were unable to determine whether the upper layer of 

 limestone actually rested on the lower basalt ; if so, the latter 

 would, of course, be an intercalated flow. Probably, however, it 

 is simply banked up against eocene strata which are connected 

 beneath with the main mass. 



There are several other exposures of the eocene on the western 

 bank in the vicinity of the four sections just described, in which, 

 for the most part, the lower basalt is the immediately overlying 

 rock. Just south of Dog Island, however, and on the opposite 

 or western side of the river, a mass of basalt, 25 feet thick and 

 only 35 feet at its base above the water, appeared to us to be 

 banked up against a limestone hill. 



The following section across the river from Bull Island, and 

 thus opposite the amphitheatre, was also observed : — 



Limestone ... ... ... 10 feet 



Lower basalt ... ... .. 50 „ 



Limestone, with fossils ... ... 25 „ 



River alluvium ... ... ... 5 ,, 



90 feet 



A few yards to the south, however, the lower basalt crops out 

 again at a height of 100 feet. We read this to mean that the 

 basalt flowed round a mound of limestone and over the main 

 mass. 



On the west of the river there are one or two extensive gullies 

 which are worth examination. We had only time to pay a 

 hurried visit to one of them, which, on account of its rugged 

 nature, we call Rocky Gully. This starts exactly opposite 

 Point Henry, and runs in a northerly direction for about a mile 

 and a half, until it terminates at the level of the upper basalt. 

 Near its head, marls and limestones, the former showing the 

 usual fossils, crop out just under the basalt, a thin layer of 

 miocene only intervening. Down the centre of the gully there 

 is a narrow water-way, thickly strewn with a confused mass of 

 basaltic boulders, often of large size, mingled with occasional 

 blocks of limestone. All of these have probably fallen from 

 above, as at the head of the gully only was any basalt //? siUi 

 noticed. We propose to examine this gully more closely on a 

 future occasion. 



