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.
4/9/2019 2:26:11 PM
Date: 20130718T172950Z
Credit: NOAA OKEANOS Explorer Program , 2013 Northeast U. S. Canyons Expedition
Location: Alvin Canyon, east wall 1088-1010m