The discovery of oil at Bolton in Hinds County, Mississippi, and Citronelle in Mobile County, Alabama, heralded a fairway of Lower Cretaceous production from the Rodessa, Sligo, and Hosston formations in the intervening area. To date, oil production has been established in 10 fields in Mississippi. All of the fields are within the salt basin and salt movement is believed responsible for most of the producing structures. The structures increase in complexity with depth.

Regional structure maps delineate the configuration on top of the Lower Tuscaloosa (Upper Cretaceous) and base of Ferry Lake Anhydrite (Lower Cretaceous). Structure maps and cross sections of Bolton field in Hinds County; Magee field in Smith and Simpson counties; Martinville field in Simpson County; Raleigh field in Smith County; Soso field in Jasper, Jones, and Smith counties, Mississippi; and Citronelle field in Mobile County, Alabama, are included to illustrate that most of the accumulations are controlled by structure. Reservoirs discovered thus far are a prelude to other Lower Cretaceous fields that will, no doubt, be discovered in the future.

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