19 
that no sharp line of demarcation can be drawn. In other cases 
portions of the different elements overlap and become intermingled, 
so that, for instance, we not infrequently find the tops of sandhills 
cropping up through the red soils of the piedmont zone. 
The deposits of the larger streams, essentially resembling those 
of the piedmont in composition, may extend completely across the 
sand plain and limestone belt to the sea, while the development of a 
considerable river valley introduces features which tend to mask 
those of the coastal plains. It is in areas between the larger streams 
that the consecutive elements of structure can be recognised most 
clearly. The best point of outlook known to the author is to be 
found on the crest of the hills east of Armadale. In this paper no 
attempt has been made to deal with the question of stream develop- 
ment in the area, nor to account for the well defined and extensive 
coastal lakes and estuaries which present so striking a feature of 
the topography from Hun bury to Mandnrak. These have been re- 
served for future study and communication to the Society. No bibli- 
ography has been included and few references have been given, as 
Jutson (loc. cit.) has provided all that is necessary in this par- 
ticular. 
