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The Permian Basin is a sedimentary basin largely contained in the western part of the U.S. state of Texas and the southeastern part of the state of New Mexico. It reaches from just south of Lubbock, Texas, to just south of Midland and Odessa, extending westward into the southeastern part of the adjacent state of New Mexico. It is so named because it has one of the world's thickest deposits of rocks from the Permian geologic period. The greater Permian Basin comprises several component basins: of these, Midland Basin is the largest, Delaware Basin is the second largest, and Marfa Basin is the smallest. The Permian Basin extends beneath an area approximately 250 miles (400 km) wide and 300 miles (480 km) long.
The Eagle Ford Formation (also called the Eagle Ford Shale) is a sedimentary rock formation from the Late Cretaceous age underlying much of South and East Texas in United States, consisting of organic matter-rich fossiliferous marine shale. It derives its name from the old community of Eagle Ford, now a neighborhood in West Dallas, where outcrops of the Eagle Ford Shale were first observed. Such outcrops can be seen in the geology of the Dallas–Fort Worth Metroplex, and are labeled on images with the label "Kef". The Eagle Ford Shale is one of the most actively drilled targets for oil and gas in the United States in 2010.