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The development of the deep horizons in the Cotton Valley field began in 1926 with the discovery of gas in the anhydrite zone of the Glen Rose formation. The productive sands are found below the anhydrite at depths ranging from 4,500 to 4,700 feet. They are lenticular in structure and productive only in certain parts of the field. An outstanding feature is that the two major pay lenses lie relatively low on the flanks, but do not extend across the top of the structure. Although these sands have produced much gas rich in gasoline, the oil yield has been discouraging. Two wells have produced approximately 320,000 barrels of oil of 53° A. P. I.
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