152 



PROF. W. J. DAKIN : EXPEDITION TO THE 



It is washed by the sea at high tide. This cliff is only from 4-7 feet high 

 and presents a flat terrace of varying width, here only a foot or so, there a 

 couple of yards (see text-figs.) . Front this, another cliff-surface rises to a 

 varying height, 14 feet in the one case shown above, to probably upwards of 

 25 feet in the other. This is marked by another limestone surface, and it is 

 possible to notice from the sea how this surface is not at the same height 

 along the stretch of coast, but varies slightly. The complete height of 



Text-fio-ure 6. 



abaut-4lt higlT 

 ReTnW 



Text-figure 7. 



Terrace -4-ft- 

 hlgh -» 



Elevahon 



22 feet in the one section and 40 feet in the other is brought about by sand. 

 On East Wallaby Island there is nowhere a thickness of 40 feet of coral 

 above sea-level. Fourteen to twenty feet is probably about the maximum, 

 and this is topped with sand. This condition, however, exists only along the 

 margin of the East coast which runs in a straight line N.E.-S.W. If a 

 traverse is made inland in a westerly direction (see map of East Wallaby Island, 

 p. 151) the sand-bills become lower, until at a distance varying from £— ^ a 

 mile inland they disappear, and one reaches an almost perfectly flat area the 



