286 
FLORIDA STATE GEOLOGICAL SURVEY. 
♦ Depth from which 
sample was obtained. 
Feet. 
Oolitic limestone . 0- 3 
Non-oolitic granular rock, including some clear grains of 
silica... 24-28 
Limestone, fossils, mostly dissolved out and replaced by 
calcite crystals . 28-32 
Limestone, compact and partly crystallized. 64-66 
Hard limestone with few fossils. 66-76 
Limestone, fossils, mostly dissolved out, leaving cavities; 
also a number of rounded or flattened pebbles... 76-88 
Hard limestone, including some water-worn pebbles. 88-99 
The following is an 
analysis of the water from 
the Miami 
wells. Analysis by the 
American Water Softener 
Company, 
Philadelphia, Pa.: 
Grains per 
Parts per 
U. S. gallon. 
million. 
Total solids. 
. 17.50 
300.01 
Calcium carbonate . 
. 12.68 
217.38 
Calcium sulphate. 
. 0.21 
3.60 
Calcium chloride . 
. 0.83 
14.22 
Magnesium carbonate .. 
. 0.59 
10.11 
Sodium chloride . 
.. 2.20 
37.71 
Free carbon dioxide ... 
..... 0.60 
10.28 
Iron, alumina and silica 
.... 0.18 
3.08 
Incrusting solids . 
... 14.99 
156.98 
Non-incrusting solids . . 
. 2.20 
37.71 
MONROE COUNTY. 
LOCATION AND SURFACE FEATURES. 
Monroe County lies along the Gulf Coast, at the extreme 
southern end of Florida. The area of the land surface, including 
the numerous keys, is about 1,125 square miles. 
WATER-BEARING FORMATIONS. 
The Key Largo Coralline Limestone and the Key West Oolitic 
Limestone make up the surface formations along the keys. On the 
