North Texas Continues As An Active And Major Producing Area. In All, 3,548 wildcat and development wells were drilled in the 15-county area in 1959, and 72,410,732 bbls. of oil were produced. 114 exploratory tests were successfully completed; these include the discovery of 57 new fields and 46 new pools, and the completion of 11 extension wells. Major new production is from the Pennsylvanian Strawn and Atoka. The more significant new discoveries were completed in the Hardeman basin, the Marietta-Sherman basin, and the Muenster arch.