FLORIDA GEOLOGICAL SURVEY


 Aquiclude below the sand-and-gravel aquifer.-Two thick clay units
of Miocene age lie between the sand-and-gravel aquifer and the upper
limestone of the Floridan aquifer in the southern part of the area (figs.
6, 10). The observed thickness of this clay ranges from about 150 feet
on Santa Rosa Island near the Santa Rosa-Okaloosa county line to about
980 feet at a location 4 miles west of Pensacola. As shown by the
structure-contour map in figure 10, the upper surface of the thick clay
units generally dips to the southwest. The top of the clay units is only


 EXPLANA1ION
 Stll Nu.trO, ind-'o ol 0Dh to the. 1,V
 Of t Io Mo0tcor Cloy. in Wl
 s. u L belCO moon So Jvol
 Contour *,psOlnl thy too tf the
 .-JO--O M'occOn Cloy, in too bolow
 moen Soo lovil
 Contour inlotv 00 I flt

 0 4 6 10 a, 1 o0.m Ada0 odrOmn 0 T Mortn
Figure 10. Map of Escambia and Santa Rosa counties showing contours on top
 of the Miocene clay units.