o' 
20 
GENERALISED SECTION ACROSS THE 
SWAN COASTAL PLAIN. 
■a. Summit level of Darling Peneplain (laterite- 
capped). 
b. Darling scarp. 
■c. Foothill zone. 
d. Ridge hill shelf (laterite-capped). 
'G. Main Darling fault. 
/. Piedmont zone with relatively rich soil. 
■q. Sandy plain with sand hills (some of them 
limestone capped), lagoons, and lakes. 
h. Coastal limestones. 
1c. Shore line. 
7. Shallow roadstead. 
m . . Garden Island reef. 
