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This report is the second in a series of reports describing the regional geohydrology of the northern Louisiana salt-dome basin. Regional geohydrologic maps in this report show the altitude of the base, the thickness, and limit of freshwater of the aquifers of Tertiary age and related confining layers in the northern Louisiana salt-dome basin, an area of about 3,000 square miles. Four geologic units of Tertiary age contain regional aquifers. From oldest (deepest) to youngest, the aquifers are in the Wilcox Group, Carrizo Sand, Sparta Sand, and Cockfield Formation. As the Wilcox is hydraulically interconnected with the overlying Carrizo, they are treated as one hydrologic unit, the Wilcox-Carrizo aquifer. The aquifers are separated by confining layers that retard water movement. In the northwestern part of the area, the Wilcox-Carrizo aquifer is separated from the underlying sand facies of the Nacatoch Sand (Cretaceous age) by a confining layer composed of the Midway Group (Tertiary age), the Arkadelphia Marl, and an upper clay and marl facies of the Nacatoch Sand (both of Cretaceous age). In the remainder of the area, the Wilcox-Carrizo aquifer is separated from an underlying Cretaceous aquifer comprised of the Tokio Formation and Brownstown Marl by the Midway Group and several underlying Cretaceous units, which (in order of increasing age) are the Arkadelphia Marl, Nacatoch Sand, Saratoga Chalk, Marlbrook Marl, and Annona Chalk. The Wilcox-Carrizo aquifer is separated from the Sparta aquifer by the Cane River Formation. The Sparta aquifer is separated from the Cockfield aquifer by the overlying Cook Mountain Formation.

Regional geohydrology of the northern Louisiana salt-dome basin, part II, geohydrologic maps of the Tertiary aquifers and related confining layers