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Figure 2-2. A. Wolfcampian structure, outline of present field and of accumulation during the Cretaceous after tilting accompanying development of Western Interior Seaway, and Woodford distribution. B. Upper Wolfcampian facies, with migration and accumulation of hydrocarbons by Cretaceous time, when there was erosion in the eastern area of Permian deposition. C. Pressure plot for reservoir during Cretaceous compared to that in Late Permian.