38 Proceedings of the Royal Society of Victoria. 



the loose sand has been removed and it is seen that the greater 

 part of the high land is formed of the consolidated rock. The 

 dune rock occupies a large area on the Otway side of the river 

 and the park like country is in strong contrast to the heavily 

 timbered mesozoics further inland. Krause has coloured the sea 

 front as mesozoic but no trace of rocks of this age are seen 

 between Cape Flinders and Castle Cove. On the west of the 

 river the high sea cliffs are formed of dune rock weathered into 

 fantastic crags and precipices, bare in some places and in others 

 clothed with low and almost impenetrable scrub. The cliffs rise 

 to a height of about 200ft. The eocene rocks which underlie 

 the dune rock near Castle Cove nowhere rise to more than about 

 30ft. above sea level, while the high land between the sea and the 

 Aire Marsh is almost entirely composed of dune rock of at least 

 200ft. in thickness. The whole of this cover is neglected by 

 Krause who maps it as miocene (of the survey). 



Eocene. 



It will be convenient to consider separately the localities 

 which we examined. 



Spud Point. 



This point is formed by a small outcrop of eocene limestone 

 which rises some 30ft. above the Aire Marsh and forms a tongue 

 shaped area a few acres in extent. On its northern border the 

 mesozoic rocks rise as a steep escarpment to a height of over 

 200ft. The outcrop is some 300 yards from Mr. Robinson's 

 house and is the one alluded to by Messrs. Tate and Dennant. 

 The rock consists of a yellow polyzoal limestone, the fossil 

 fragments being much comminuted and mixed with quartz grit 

 and pebbles up to a cubic inch in size, most of these being well 

 rounded. The limestone is in places very hard and contains 

 rounded concretionary masses of glazed limonite which are 

 sometimes a couple of inches in diameter and from their 

 resemblance to potatoes probably give the point its local name. 

 In places a glazed deposit of limonite spreads over the joint faces 

 in broad patches. Identifiable fossils are scarce, the rock being 

 principally composed of worn polyzoa and stems of Isi's. The 

 stratification is not veiy clear but is apparently horizontal. 



