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Figure 3-2. A. Wolfcampian structure and outline of present field from gas expansion in the Quaternary. B. Upper Wolfcampian facies, with present field limits, due to gas expansion, and geomorphic features (after Frye and Leonard, 1952) that caused accelerated erosion in the area during the Pleistocene. C. Pressure plot for reservoir during Quaternary in comparison to Late Tertiary.