The Torreon and Pedricenas quadrangles are in central Mexico between parallels 25 degrees and 26 degrees N. and meridians 103 degrees 20' and 104 degrees W.; together they embrace 7,600 square kilometers. The northeastern corner of the area lies in the Bolson de Mapimi; most of the area, however, is in the Sierra Madre Oriental.
Earth and Planetary Sciences
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Department of Earth and Planetary Sciences
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Clemons, Russell E.. "Geology of Torreon and Pedricenas Quadrangles, Coahuila and Durango, Mexico." (1962). http://digitalrepository.unm.edu/eps_etds/128