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Figure 6. Stratigraphy of the Claiborne Group. Downdip, organic-rich shaley facies of Wilcox Group, Reklaw, Queen City, Sparta, Cook Mountain, Yegua, and Cockfield Formations of the Claiborne Group all have been postulated potential source rocks at depth. From Guevara and García (1972), Wescott and Hood (1994), Schenk and Viger (1996), Hosman (1996), Galloway et al. (2000), and Warwick et al. (2002).