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Chalk Cliffs, located 13 km southwest of Buena Vista, Colorado, are highly weathered, sparsely vegetated cliffs of quartz monzonite. Rockfall from the cliffs accumulates in channels below and provides material for frequent debris flows (~3 per year). The purpose of this study was to quantify the rates and controls on rockfall as part of a broader effort to understand debris-flow processes at Chalk Cliffs. Rockfall sediment accumulation and accompanying...