Geology 2

The St. Francois Mountains and Layers G and H are the recharge area of the St. Francois Aquifer. As can be seen in Figure 4, the same parent rock forms the lower confining layer of the Ozark System. The entire system drains outwards from the mountains as the aquifer elevations generally decrease in those directions. A spatially correct aquifer layering are shown in Figures 5 and 6 (Clark et al., 2019). The Layers are identified by number instead of letter. These figures are along two perpendicular transects that do not run true north and south or east and west but follow the central axes of the Ozark Uplift. These figures represent the best picture of aquifer depths and layers. They also clearly illustrate the relationship between the Salem and Springfield Plateaus and the generally downward slope of aquifer layers. The detailed geological column of these layers is presented in Table 3.