Abstract
The Gilbertown field is in Choctaw County, southwestern Alabama. The major production is from Eutaw (Austin age) sands in traps along the upthrown side of an east-west fault system. Production is also from the overlying Selma chalk (Navarro and Taylor age) on the downthrown side of the faults, from a fractured zone coincident with or just above the fault plane. Regardless of its relative structural position, no porosity has been found; hence, no accumulation of oil occurs at Gilbertown in the Selma section where it has not been cut by a fault.
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