Trans-Pecos Texas Our state's most diverse province; an eclectic blend of mountains, plateaus, and plains, overlying an equally varied geological base. Modest exposures of ancient Precambrian rocks are encountered near Van Horn and El Paso, and Paleozoic sedimentary rocks are found in some abundance throughout the area. Younger Mesozoic marine sedimentary rocks are very abundant, as are Cenozoic sedimentary and volcanic rocks. Much of the region consists of north-south elongated, fault-bound basins. These include the GuadalupeRange, with GuadalupePeak (8,751 feet above sea level). The GuadalupeMountains are composed of late Paleozoic (Permian) limestone, and they are but a small exposed part of the ancient Capitan Reef which formed in Late Paleozoic time
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Sedimentary rocks, Geological history of Earth