In a thought-provoking note on the origin of the oil and gas in the giant Oklahoma City field, Webb (1976) has called on recent geochemical concepts of minimum-temperature environment for oil generation in the formulation of his hypothesis. Assuming that the oil now held in the pre-Pennsylvanian reservoirs at Oklahoma City field (Fig. 1) is indigenous, he has proposed that Ordovician Arbuckle “… source rocks which were spared from erosion at the unconformity and then buried again while still thermally immature” (p. 121) produced a “second crop” of oil from a “preservation window” after burial below Pennsylvanian and...

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