The Paradox basin, Colorado Plateau, an elongate wedge of northwest-trending Cambrian to Quaternary sediments more than 20,000 feet thick near the Uncompahgre front, is formed by 15,000 feet of Pennsylvanian-Permian arkose along the northeast border, a 6,000-4,000 ft wedge of Pennsylvanian evaporites in the center area, and a peripheral, carbonate facies to the south. The bulk of the oil production comes from block-faulted Mississippian carbonates beneath salt anticlines along the northeast side (Lisbon field), and from plate algal mounds within the Pennsylvanian carbonate facies, in the southeast corner of the basin (Aneth and Ismay fields).

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