4 BUREAU OF GEOLOGY
x -300 DepM in feet below sea level.
- Edge of Floridan Plateau x -300
-X 0 AMPA
, .: :t  \ -100 x -':":>: 200 x. 
,..V -4,oo -.
A/,
-~300 .3 00 X
-20600
3.0x-300
-lo, aoo x /:'.
wGua: of rax/1/i
MEXICO - -. "
,,.- ;,,!7 ..
Figure 2. Oblique view of the Floridan Plateau, showing the islands of the Florida Keys fringing its southern rim.