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Strata exposed in the La Popa Basin of northern Mexico range in age from Late Jurassic through middle Eocene and record the evolution of the region currently lying in the foreland of the Sierra Madre orogen from extensional to contractional tectonics. The facies distribution and geometry of the strata demonstrate that salt diapirism was active at least from late Aptian–middle Eocene. Jurassic rocks include evaporites of the Oxfordian-Kimmeridgian Minas Viejas Formation, which is exposed only in diapiric bodies in the basin. The evaporites contain three types of blocks transported to their present levels during diapirism: (1) mafic to intermediate...

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