Meredith Dane Picard, Boyd Ray Brown; Revised lower Paradox member (Pennsylvanian) cross section in Four Corners region; correction to 'Geology of Pennsylvanian gas in Four Corners region' by B. R. Brown and others (1960). AAPG Bulletin ; 45 (9): 1578–1579. doi:
Recent work indicated changes in correlation of the lower Hermosa member and Barker Creek zone from the Alkali Gulch gas field in southwestern Colorado to the Barker Dome and Ute Dome gas fields in northwestern New Mexico. The revised cross section shows the correlative lithologic changes and gas-producing zones.