Thick, clastic deposits of Neocomian age mark the margin of the former Coahuila Peninsula of northern Mexico. They contain a large fauna, consisting mainly of mollusks and brachiopods, the study of which has made possible correlations of the various facies of the Mexican geosyncline. The faunal assemblage is remarkably similar to that in the Neocomian deposits of France, England, and Switzerland, and belongs decidedly in the Mediterranean province. No species in common are known between the Neocomian deposits of Mexico and the Upper Jurassic Malone formation of Texas.

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