| Plot showing sand content (%) as a function of normalized bluff position (depth/bluff. height) at the various sites for which sediment data was available. The plot also identifies the erosion mechanism inferred based on aerial photo analysis. Note, in some instances, only a single bluff sample was analyzed and these data are plotted as dots. Note, the low sand content of one core (BSC41b in Table 1), identified as a site of bluff face thaw/ slump erosion, appears to be an outlier. However, the coarse sediment areal density of this site (82.7 g/cm 2 , Table 1) is similar to that calculated for other bluff face thaw/slump sites.

| Plot showing sand content (%) as a function of normalized bluff position (depth/bluff. height) at the various sites for which sediment data was available. The plot also identifies the erosion mechanism inferred based on aerial photo analysis. Note, in some instances, only a single bluff sample was analyzed and these data are plotted as dots. Note, the low sand content of one core (BSC41b in Table 1), identified as a site of bluff face thaw/ slump erosion, appears to be an outlier. However, the coarse sediment areal density of this site (82.7 g/cm 2 , Table 1) is similar to that calculated for other bluff face thaw/slump sites.

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Two prominent arctic coastal erosion mechanisms affect the coastal bluffs along the North Slope of Alaska. These include the niche erosion/block collapse mechanism and the bluff face thaw/slump mechanism. The niche erosion/block collapse erosion mechanism is dominant where there are few coarse sediments in the coastal bluffs, the elevation of the b...

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Context 1
... average, the distance between location with sediment data and photos was about 6 km. For each photo, sand and gravel content data from one proximal core or bluff sample was used to determine the sediment areal density (Figure 7). Locations experiencing niche erosion/block collapse were readily determined based on the characteristic erosional blocks (Figure 8). ...