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By: Mattox, Richard Benjamin, - Brand, John Paul,Edition:Publication info: [Lubbock], Museum, Texas Tech University, 1974Volume: no.19 (1974)Series:Holding Institution: Museum of Texas Tech UniversitySubjects: From 230 to 280 million years ago Geology Geology, Stratigraphic Permian Permian Geologic Period San Juan County UtahBHL Collections: Expanding Access to Biodiversity Literature