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Periods of fire-related sedimentation over the last 5000 radiocarbon years. The probability curve was produced by summing the probability distributions of all samples. Therefore, higher peaks represent a greater probability that fires occurred at that time. Above the probability distributions are periods of drought in the La Plata Mountains (Petersen, 1988), determined based on pollen records, and peak periods of fire-related sedimentation in Yellowstone National Park (Meyer et al., 1995).