Bio-eroded layers are probably chalk. An example of the layered nature anddifferential erosion of the stratigraphy exposed along the walls of the canyon.
4/9/2019 2:26:15 PM
Date: 20130722T184101Z
Credit: NOAA OKEANOS Explorer Program , 2013 Northeast U. S. Canyons Expedition
Location: Block Canyon, east wall 2131-2062m