The cross-section below is one example of the TDEM fieldwork. It shows highly resistive sediment (and limestone) at the surface which represents the surficial and Castle Hayne aquifers. Those become salty with depth (less resistive). Also, the Cretaceous aquifers are seen as a more resistive tongue starting at the western edge between about -300 & -800 feet elevation. Overlying the contoured TDEM data are geologic, electric and gamma logs from two boreholes that fall along the cross-section line. At depth the more resistive material is bedrock.

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