Abstract
Knowledge of the surficial geology is a processor to developing an understanding of the regional hydrogeology. Surficial geologic mapping in Florida is problematic because of the low relief and sand cover. The mapping effort in Lee County relied heavily on data from well cuttings and cores due to the sparse occurrence of pits, quarries and natural outcrops. The authors have spent many years visiting pits and quarries and working subsurface samples to develop an understanding of the regional geologic framework. The accumulated database was utilized to determine sand overburden thickness and the underlying stratigraphic units for creating the Lee County geological map. The geologic units mapped were the Tertiary Tamiami Formation (Tt), Tertiary-Quaternary shell units (Tqsu-includes Caloosahatchee, Bermont, and Fort Thompson Formations of previous usage) and Quaternary (Holocene) coastal and estuarine sediments (Qh). Less than 20 feet of undifferentiated sands occurred within the map area.