Sponges are the dominant large fauna seen on this basalt outcrop. Perhaps acascading flow of lava frozen in time left this stairstep pattern.
4/9/2019 2:26:46 PM
Date: 20130804T175911Z
Credit: NOAA OKEANOS Explorer Program , 2013 Northeast U. S. Canyons Expedition
Location: Mytilus Seamount, north side, 3271-2750m