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Figure 3 - A recent (1997) debris flow (surface 1) initiated in the headwaters of Reservoir Creek and incised through alluvial fan surface 2 exposing a sequence of deposits from individual erosional events. Fire-related deposits, collected from an exposed vertical profile in surface 2, were radiocarbon dated to reconstruct the depositional history of alluvial fan surface 2. The fire and fire-related depositional history spans the last 6500 cal yr BP. Fan surface 3 is undated but is older than surface 2. The recent debris flow deposit contains poorly sorted angular rocks. The fine-grained matrix has been removed in the distal deposit (bottom of photograph) by high water in the main-stem river. All three fans have been truncated by the main-stem river.

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Uploaded: Sep18 11

Last Modified: 2011-10-31 16:21:27
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