Differential erosion between weaker (possibly chalk) and stronger (porcellanite?) lithologies resulting tabular slab failure of the stronger rocks.  Weaker rocks have undergone significant bio-erosion.

Differential erosion between weaker (possibly chalk) and stronger (porcellanite?) lithologies resulting in tabular slab failure of the stronger rocks. Weaker rocks have undergone significant bio-erosion. Image courtesy of NOAA Okeanos Explorer Program, 2013 Northeast U.S. Canyons Expedition.

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Related Links

Northeast U.S. Canyons Expedition 2013: August 13 Log

Northeast U.S. Canyons Expedition 2013

NOAA Ship Okeanos Explorer