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.
Image 30796 is a 611 by 757 pixel WebP
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Sep18 11
