Commercial production was obtained by the Barnsdall Oil Company from Guijarral Hills on September 19, 1948. The producing sand is apparently a large lentil in the so-called "Leda zone" in the upper part of the Kreyenhagen shale formation. Productive limits of the "Leda sand" as well as the oil possibilities of the Eocene-McAdams sand will be determined by future drilling.

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