102 
Florida geological survey—14TH annual report 
Soft sand rock .. 
Blue clay ..J 
Soft sand rock . 
Blue clay .. 
Lime shells . 
Soft lime, first water.... 
Coquina rock . 
Hard lime . 
Sand, salt water . 
Hard shell ... 
Sand rock, fresh water. 
Lime shell .... 
Sand rock .... 
Lime .,. 
White sand .. 
Lime . 
Soft sand . 
Shell . 
Yellow sand .. 
Lime shell . 
Yellow sand ... 
Lime shell . . 
Thickness. 
Depth. 
35 
795- 830 
4 
830- 834 
30 
834- 864 
5 
864- 869 
1 
869- 870 
10 
870- 880 
15 
880- 895 
5 
895- 900 
5 
900- 905 
2 
905- 907 
8 
907- 915 
2 
915- 917 
10 
917- 927 
8 
927- 935 
4 
935- 939 
5 
939- 944 
5 
944- 949 
1 
949- 950 
100 
950-1050 
2 
1050-1052 
10 
1052-1062 
4 
1062-1066 
DE SOTO COUNTY 
De Soto County lies north of Charlotte County, near the Gulf coast. 
In the western and northwestern parts of the county is found Cower 
Miocene (Alum Bluff), covered for the most part by a veneer of Plio¬ 
cene (Bone Valley formation). No records of deep wells in this county 
are available, although water wells for public supplies have been drilled 
to a depth of 620 feet. 
DIXIE COUNTY 
Dixie County lies adjacent to the Gulf coast, west of the Suwannee 
River. On the Suwannee River, at the east side of this county are found 
exposures of the Ocala (Eocene) limestone. The Chattahoochee lime¬ 
stone is probably present as a thin formation over parts of the county. 
No deep wells are recorded. 
DUVAL COUNTY 
Duval County borders the Atlantic coast in northeastern Florida. The 
southwestern part of the county extends on to the uplands approaching 
Trail Ridge. The surface formations near the coast are Pleistocene, al¬ 
though at Jacksonville the Miocene comes to the surface. \Vells drilled 
at Jacksonville indicate that Eocene limestones are reached at that place 
