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The depositional environment and provenance of the Santa Clara Formation of the Upper Triassic Barranca Group in eastern Sonora were studied based on a detailed description of 875 m of section and study of 123 thin sections from both outcrops and cores.

The Santa Clara Formation is a cyclic unit with typical fluvial cycles of 4 to 16 m. Highly altered, quartz-rich sandstone is interbedded with black and gray shale and minor beds of graphite and anthracite, which were formerly mined. Detrital chert and remobilized chert cement are significant features of the sandstones of the Barranca. Diagenesis is extensive, of...

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