2 
MUSEUM BULLETIN NO. 14. 
broad river-wom lowland, but which were subsequently separated 
from the mainland by widespread coastal subsidence, probably 
early in the Pleistocene. Since the submergence of the lowland, 
the islands in their exposed position have suffered on all sides 
from the attack of the sea. In the cliffs which encircle them, one 
can see almost continuous sections of red and grey Carboniferous 
sandstones and black volcanic rock, contrasting in an attractive 
way with the smooth green slopes of pasture and forest which 
rise inland to curious dome-shaped summits. These round hills 
or “demoiselles” as they are called complete a landscape which 
