The major oil production at Spindletop now comes from the south, southwest, and west flanks of the dome. The oil is found in the Middle and Lower Miocene and to some extent in the Middle Oligocene formations. The sands are very lenticular and irregular, and can not be correlated from well to well, rarely even in the case of two adjoining wells. The Spindletop field has been an extremely prolific producer. The old cap-rock area has produced approximately 50 million barrels of oil and the new flank area through 1936 has produced approximately 75 million barrels of oil. Detail cross sections of the dome suggest the possibility of overhang. If this is true, the dry flanks of the dome may yet offer the possibility of future production.

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