Hackley, Paul C. phackley@usgs.gov,Enomoto, Catherine B. cenomoto@usgs.gov,Valentine, Brett J. bvalentine@usgs.gov,et al. Assessment of undiscovered continuous oil and gas resources in the Upper Cretaceous Tuscaloosa marine shale of the U.S. Gulf Coast, 2018:U.S. Geological Survey,2018.