GEOLOGICAL NOTES ON THE CLIFFS SEPARATING 
ALDINGA AND MYPONGA BAYS. 
By Epwarp Vincent Ciark, B.Sc. 
[Communicated by Pror. Tark.] 
[Read November 7, 1899.] 
sea-level. Both sets of beds are last seen as reefs between low 
and high water, but as the dip of the Miocene is the smaller, the 
reef formed by it is much larger than that of the Eocene, extend- 
Somewhat further if the sand has been swept b a storm. 
The Post-miocene clays which cap the cliffs then gradually € 
ordinary high tide is a bank of shingle, increasing in size as we 
from where the Miocene reef disappears these no | 
covered with vegetation, and behind them is a lagoon in a basin 
that was f rly an arm of the sea, but which has re- 
sediment washed down from the Sellick’s Ranges. . on is 
how fresh water, or only slightly brackish when full, but dries up 
nearly every summer. Dead shells of Cowiella confusa are in 
Profusion in the silt. ; i 
From this point the sandhills give place to a clayey deposit, 
still flanked by the bed of shingle (which is much coarser here), 
nd rising somewhat rapidly in height—about one foot per chain. 
This clay bears a considerable likeness to the mottled clays over- 
lying the Miocene at Blanche Point and the jetty, with the 
exception that it contains a vast amount of gravel, arra n 
= 
v 
