Figure 14. Hydrocarbon systems of the U.S. Gulf Coast. From Hood et al. (2002). Claiborne Group outcrop from Schruben et al. (1994); Wilcox shelf margin from Galloway et al. (2000). This diagram shows families of oil and gas originating from common source rocks, as compared to Figure 2 which shows the boundary of the Upper Jurassic-Cretaceous-Tertiary Composite Total Petroleum System that was defined for this assessment.