The writer reviews and compares Jurassic stratigraphy and sedimentation within the various Jurassic sedimentation provinces of northeast Mexico and the southern United States. Many of these provinces are being explored actively. Of great importance is the presence or absence of adequate reservoir rock, particularly within the Late Jurassic Smackover-Zuloaga equivalents. Before active exploration can begin, regional studies must be made to determine where porous facies are most likely to be present. Stratigraphic dip sections of the Jurassic section must be made, and the various units correlated. Dip sections cannot be made at random but must be located strategically. Lithofacies maps must be made to show in detail the lateral lithologic changes in the various units. Sever l producing fields in Texas, Arkansas, and Mississippi are good examples of the types of producing structures which may be expected. Economics and reservoir characteristics of the producing fields must be understood thoroughly before a particular structure or other type of trap is drilled. The understanding of economics and reservoir characteristics can be gained through detailed study of existing Jurassic fields.

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