U.S. GEOLOGICAL SURVEY

PLATE 5

MAPS SHOWING AREAS OF SALT WATER CONCENTRATION AT MIAMI, FLORIDA IN 1904,1918, AND 1943
NOTE: STIPPLING SHOWS EXTENT OF AREAS THAT HAVE CHLORIDE CONCENTRATION APPROXIMATING 1000 R R M. OR MORE, AT A DEPTH OF ABOUT 80 FEET.

MAIM. FLORIDA