In addition to being rafted by ice and by drifting logs, pebbles may be carried by kelp holdfasts to be dropped into deep-water sediments after the floating kelp has decayed or been eaten. Many shallow-water organisms similarly may be deposited in foreign environments. Numerous pebbles and cobbles still attached to kelp have been picked up on beaches, and in at least two instances pebbles with remnants of holdfasts have been found in relatively deep dredgings of the ocean floor. Although large kelps with floats are limited essentially to the Pacific and Antarctic regions, smaller algae from other coasts are also known to raft pebbles and shells long distances.

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