Georgia Geologic Survey Bulletin 131
Analysis of cores and geophysical logs for ten coreholes and wells in the coastal area of Georgia has allowed a detailed synthesis and correlation of the Oligocene and Miocene strata across this area. A total of eighteen unconformity-bounded Oligocene and Miocene stratigraphic units can be recognized in the area. Erosion during the times represented by the intervening unconformities has produced cut and fill patterns that greatly complicate the stratigraphic and hydrologic patterns across the region. The Tiger Leap Member of the Parachucla Formation of Huddlestun and the Ebenezer Member of the Coosawhatchie Formation of Huddlestun are raised to formational rank. With these changes, the eighteen unconformity-hounded stratigraphic units can be clustered into seven lithologically distinctive formations. At the same time, however, these stratigraphic units also compose three hydrologic aquifers and their conforming units. By integrating and clarifying the relations between stratigraphic units and hydrologic units, a more useful framework for both stratigraphers and hydrologists can be achieved than by basing the stratigraphic system on only one of these two concepts.
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Lower Oligocene stratigraphic units
Upper Oligocene and Miocene stratigraphic units
Pliocene stratigraphic units
PIeistocene strati.graphic units
Depositional environments and lithofacies
Influence of lithofacies on water availability