DS926 Digital surfaces and thicknesses of selected hydrogeologic units of the Floridan aquifer system in Florida and parts of Georgia, Alabama, and South Carolina -- Limestone boundary for the APPZ (Reese and Richardson, 2008)

Digital surfaces and thicknesses of selected hydrogeologic units of the Floridan aquifer system were developed to define an updated hydrogeologic framework as part of the U.S. Geological Survey Groundwater Resources Program. This feature class contains a line that shows the northern extent of predominantly limestone forming the APPZ. North of this line the APPZ is comprised mostly of highly permeable dolostone. South of this line the APPZ is comprised of lower-permeability limestone.