The "Baton Rouge megastructure," a giant structural complex at least 20 mi (36 km) long and 15 mi (24 km) wide, is emerging as the dominant one of several exceptionally large structural features in the Tuscaloosa gas trend. False River reservoir A and reservoir B, Profit Island, Irene, and Port Hudson fields, all large fields in themselves, are merely separate structural closures and fault blocks on the partially explored megastructure. Other fields will surely be found within the 300-sq-mi (780 sq km) area presently indicated to be productive.

The "Judge Digby megastructure," a slightly lesser feature just west of the "Baton Rouge megastructure," also contains major gas reserves. These two represent the largest structural features currently known in the trend.

Indicated reserves on these two megastructures total approximately 17.5 Tcf of gas and 1 billion bbl of condensate, representing 1/12 of the United States gas reserves and 1/30 of the United States crude oil or condensate reserves. Across south Louisiana the trend has the potential of producing at least 50 Tcf of gas and 2 billion bbl of condensate.

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