From photographs taken from the Cape. 
Fic. 40. Panorama of the stone reef south of Cape Santo Agostinho. 
Over this valley only a 
few small isolated hills 
rise above the general 
level. The bay seems 
shallow save opposite 
the Barra do Suápe, 
the only big break 
in the reef, where the 
scour of the tides has 
kept the silts from 
accumulating. 
The hills that face 
the bay at the cape are 
mostly crystalline 
rocks, granites, gran- 
ite-porphyries, and al- 
tered eruptives, with 
patches of Tertiary (7) 
sediments lying over 
and against them. 
These hills are about 
fifty metres high. From 
the cape at the old fort 
they strike westward 
and after following that 
direction for several 
kilometres swing south- 
ward and finally ap- 
proach, but do not 
quite reach the sea 
again at Serramby 
Point, some thirty odd 
kilometres from the 
Cape. These hills are 
of pretty even elevation 
where they are near the 
coast, but nothing can 
be said here of their 
forms or elevation at 
the west edge or bot- 
tom of this ancient 
embayment. 
On the plain just 
