Figure 1. Locality of study area. (A) Southeastern USA and location of Miami-Dade and Broward Counties, Florida. (B) Location of the Lake Belt area in SE Florida. (C) Location of the study area within the Northwest Well Field and much of the Lake Belt area. (D) Details of part of the study area, including location of injection, observation, and some of the municipal supply wells within the Northwest Well Field.

Figure 2. Correlation of ages, formations, stratigraphy, and hydrogeologic units of the Tamiami Formation, Fort Thompson Formation, and Miami Limestone from various authors and this study.

Figure 3. Idealized fifth-order cycles (Table 2) for the Fort Thompson Formation and Miami Limestone.

Figure 4. Conceptual hydrogeologic column for the Northwest Well Field including ages, major depositional environments, groundwater-flow types, pore classes, lithofacies, cyclostratigraphy, Q-units of Perkins (1977), formations, and hydrogeologic units.

Figure 5. Conceptual facies model showing relations between major lithofacies, depositional environments, and pore classes for the Fort Thompson Formation at the Northwest Well Field (Fig. 1 and Fig. 2).

Figure 6. Hydrostratigraphic correlation section A-A' between the S-3163 and S-3164 production wells, including six digital optical image logs from observation and injection wells at the Northwest Well Field (Fig. 1D).

Figure 7. Digital image of a borehole wall that spans a highly porous and permeable stratiform groundwater flow zone at the base of highfrequency cycle HFC2e2 in injection well G-3816 (Fig. 4 and Fig. 6).

Figure 8. Correlation of cyclostratigraphy, lithofacies, pore classes, and borehole geophysical logs for injection well G-3773, observation well G-3772, and open hole interval of production well (S-3164) at Northwest Well Field (Fig. 1D).

Figure 9. Graph showing breakthrough curves for two tracers, Rhodamine WT and deuterated water (²H), based on groundwater samples collected from pumping well S-3164 during a tracer test conducted at the Northwest Well Field in April 2003 (Fig. 1D).

Tables

Table 1. Ideal cycles of the Fort Thompson Fm and Miami Limestone at the Northwest Well Field

Table 2. Terminology of stratigraphic cycle hierarchies and orders of cyclicity

Table 3. Pore classes (I, II, III) related to aquifer attributes at the Northwest Well Field