Warning: Last items in stock!
BL2738D. The Geology and Mineral Resources of the Fort Stockton Quadrangle, by W. S. Adkins. 166 p., 1 map, 6 plates, 1927. Downloadable PDF
From the Introduction
The geologic column in Pecos County consists of a great thickness of Paleozoic, mainly Permian, rocks overlain by a considerable amount of Mesozoic, mainly Comanchean rocks. The Paleozoic is exposed in the southern part of the county in the uplifts of the Sierra Madera and the Marathon dome, and most of the rest of the county has Lower Cretaceous rocks at the surface. The sections of both Paleozoic and
Cretaceous rocks are very different in northern and in southern Pecos County. In southern Pecos County the Paleozoic consists of "normal" formations, with considerable limestone; northwards these formations which have been reached by the drill (Permian) have changed largely
into a saline series of red beds, salt, gypsum, dolomite, anhydrite, and other rocks produced in a desiccating sea and included in the western portion of the large West Texas Permian Salt Basin. The Cretaceous rocks of southern Pecos County are mainly hard limestones carrying rudistids at many levels; northwards these become thinner, partly by progressive overlap of the basal Cretaceous beds onto the older floor, and consist mainly of softer marls and marly limestones alternating with harder rudistid-bearing "caprocks."
The main features of geologic interest in the quadrangle are (1) the stratigraphy and structure of the Permian beds, and (2) the description of a standard section in the Lower Cretaceous. Field work was done in 1920-21 and 1926.
Keywords: Fort Stockton area, minerals, mineral resources, Pecos County, Texas
Adkins, W. S., 1927, The Geology and Mineral Resources of the Fort Stockton Quadrangle: University of Texas, Austin, UT Bulletin No. 2738, 166 p.