THE ARTESIAN WATER SUPPLY OF EASTERN FLORIDA. 
143 
is a matter of difficulty. This interval in St. Johns County is oc¬ 
cupied largely by clays although some sand, shell and rock strata 
occur. 
Fig. 12.—Map showing the area of artesian flow in St. Johns 
County. The area in which flowing wells can be obtained is indicated 
by shading. 
