The 120-fm terrace at Cobb Seamount is broad, gently sloping, and mantled with a layer of skeletal sand. A break in slope occurs at approximately 130 fm, beyond which the more steeply dipping surface changes to a mixture of sand, shell, and cobble. The 45-fm terrace appears to be a smooth, level, abrasion platform with occasional elongate mounds (erosional remnants) and depressions (vents or lava tubes). A bare, blocky cliff, 25 fm high, rises steeply behind the 45-fm terrace.

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