406 COASTAL SHELVES 



into the hard dune limestone with land shells. They 

 are an old beach formed when the land stood somewhat 

 lower than at present. It is a curious fact that the 

 dune limestone passes below sea level in Saldanha Bay 

 and on the south coast ; this rock on careful examination 

 is always distinguishable from the calcareous beach de- 

 posits, and its occurrence below sea level in the same 

 districts as the raised beaches points to a slight sinking 

 of the land since the beaches were formed and elevated. 

 At Kikoe's Vlei south-east of Saldanha Bay a bore-hole 

 has proved the existence of superficial deposits down to a 

 depth of over 50 feet below sea level. 



In the Cape Peninsula there are a few patches of 

 supposed beach deposits at a height of from 50 to 100 

 feet above the sea. They contain the remains of living 

 species of mollusca. The Green Point Common is a 

 fine example of a coastal shelf ; a hard limestone con- 

 taining shells occurs on it, at one point about fifteen 

 feet above sea level. 



In the neighbourhood of Hermanus there is a very 

 well-marked rock shelf between the Klein River Moun- 

 tains and the coast about fifty feet above the sea. It is 

 a wave-cut terrace of Table Mountain sandstone, covered 

 in places with dune limestone. Similar terraces are to 

 be found near Danger Point, Zout Anys Berg and Pot 

 Berg. At Cape Infanta there is a raised beach at the 

 base of the dune-limestone, which there forms high 

 cliffs. The beach conglomerate is about 100 feet above 

 the sea. On the shores of Algoa Bay there is a well- 

 developed terrace cut through the Uitenhage beds ; it 

 slopes gradually towards the sea from a height of about 



