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Figure 6. Oblique aerial photograph of bluffs in Harborcreek Township, Pa. (see fig. 3 for location). The base of the bluff in this location is exposed Devonian sandstone and shale, which is overlain by unconsolidated glacial deposits (contact indicated by yellow line). Bluff recession rates tend to be lower where the basal exposures are bedrock. Photograph from Pennsylvania Coastal Resource Management Program.

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