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Citronelle developed on what is known as the Citronelle Dome, a salt dome formation that is still rising, as shown by the centrifugal drainage of streams away from the center. In 1955 oil was discovered in this geologic structure at a greater depth than had previously been considered as feasible. The Citronelle Dome was developed as among the first of many "deep" oil fields. The discovery well yielded oil from the Glen Rose Formation at a depth of 10,879 ft (3,315.9 m). "Citronelle Dome is a giant salt-cored anticline in the eastern Mississippi Interior Salt Basin of southwest Alabama.