The currents in this area are very strong and there is little to no modern sediment deposited
on the pavement. There is, however, evidence of older, "relict" sediments that once formed
ripples in the swift currents. These sediments now appear brown, as they have been
encrusted with iron-manganese oxides, precipitated from the seawater. The two green dots
from the sub's lasers measure 25 cm.

Video frame grab, JSLII Dive 3461, top pavement of Sponge Cliff, Blake Plateau (1700 ft).