The Permo-Pennsylvanian zeugogeosyncline of central Colorado was the site of extensive evaporite deposition, especially in the northwestern part of the trough. Gypsum crops out principally in the Meeker and Dotsero-Eagle areas, pinching out to the S. and E., but sporadic occurrences are known through South Park and as far S. as Coaldale. Primarily Pennsylvanian in age, the gypsum was forced into irregular domes and anticlinal accumulations by Laramide and younger movements. Two major Pennsylvanian gypsum localities occur in the Wellsville area. A third gypsum occurrence is considered to be Quaternary in age. Since 1952 approximately 50,000 tons of gypsum have been removed from these deposits and sold as a soil supplement by the U.S. Soil Conditioning Company of Salida.

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