Up to 3500 m of marine Paleozoic carbonates and shales fill Sonora and Chihuahua basins (northwest and north-central Mexico), the Paleozoic geosyncline (from western Coahuila to Oaxaca), and the Chiapas-Guatemala basin (southeastern Mexico). Cambrian, Ordovician, Silurian and Devonian rocks are scarce, discontinuous, and mostly in northern Mexico; Mississippian and Pennsylvanian rocks are widespread but thickest in northern and central Mexico; and Permian rocks are most widespread but thickest in the Paleozoic geosyncline and the Chiapas-Guatemala basin. Paleozoic rocks are drilling objectives in north-central Mexico.

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