[geology] Pockmarks are craters in the seabed caused by fluids (gas and liquids) erupting and streaming through the sediments. Pockmarks were discovered off the coasts of Nova Scotia, Canada in the late 1960s by Lew King and Brian McLean of the Bedford Institute of Oceanography. Pockmarks are uncommon on the land surface, and are expected i... Found on http://en.wikipedia.org/wiki/Pockmark_(geology)