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The document summarizes the Catahoula Formation exposed near Sam Rayburn Reservoir in eastern Texas. The Catahoula Formation is a Oligocene/Miocene volcaniclastic unit composed of quartz-rich fluvial material mixed with distal rhyolitic air-fall ash from volcanic areas in West Texas and northern Mexico. It consists of poorly sorted siltstones, sandstones, and mudstones, with the silt-size fraction containing abundant slightly altered volcanic glass shards. The formation represents sporadic influxes of air-f

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