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Description
Layers of resistant porcellanite rock interleaved with less resistant chalk that forms the eroded recesses. In this area, silt has sifted down from abovecovering many of the individual ledges formed by the differential erosion of the two rock types. Eventually the protruding layers will fail by slab failureeating away at the canyon walls. (Image credit: NOAA OKEANOS Explorer Program , 2013 Northeast U. S. Canyons Expedition)