The Mooringsport Formation in the study area is 400 to 600 ft thick and is predominantly clastic. Top of the formation is at an average depth of 11,050 ft. Consists of a sequence of shales and mudstones with some subordinate limestones, sands, and siltstones. The shales are maroon, dark-red to gray, firm, and finely micaceous with greenish-gray mudstones interstratified. The basal Mooringsport contains thin anhydrite stringers. Overlies Ferry Lake Formation and underlies Paluxy Formation. Produces from only one well. Age is Early Cretaceous (Comanchean).

Source: GNU records (USGS DDS-6; Reston GNULEX).

According to the isopach map prepared for the study area, thick and thin areas of the Mooringsport are oriented generally northwest-southeast. In southernmost Mobile and Baldwin Cos, the formation thickens southward to 302 ft in a well just off Dauphin Island and 309 ft in the mouth of Mobile Bay. Unit thins to 177 ft about 9 mi east of Fairhope in Baldwin Co. In western Escambia Co, the formation changes facies to red beds and becomes more sandy, eventually becoming indistinguishable from overlying and underlying units. Correlates with the Sunniland Formation of south FL. Transitionally overlies Ferry Lake Anhydrite and underlies the Paluxy Formation. The top is placed below the lowest sandstone of the Paluxy and the bottom is defined as the contact of limestone with the massive anhydrite of the Ferry Lake. Age of the Mooringsport is Early Cretaceous. In Mobile Co., AL, it is early Albian, while in the MS subsurface, it was determined to be middle Albian by Nunnally and Fowler (1954).

Source: GNU records (USGS DDS-6; Reston GNULEX).