The discovery of commercial oil and gas production in the Claiborne section of southwest Texas and northern Mexico during the past year or two has brought this area into prominence. The various oil and gas producing horizons of this area are discussed and two cross sections prepared to show the relation of one field to another and correlate them with adjacent areas in northern Mexico.

The possibility of deep production on several relatively unknown structures in the area is pointed out together with notes on the older fields producing from the Claiborne section.

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