. Shore processes and shoreline development . Bank on the south coast of England, ])y descending to adepth of 60 or 65 feet below the surface of the sea in diving found that after a heavy storm the shingle, which was pre-viously covered with barnacles, was quite free from these shells,proving a movement of the coarse material at a depth of nearly50 feet^^ According to Hermann Fol, whose Impressionsdun Scaphandrier are vividly recorded in the Revue Scienti-fique for 1890^^, a diver at a depth of 100 feet is tossed back andforth by the vigorous oscillatory movement of the bottom waterwh
. Shore processes and shoreline development . Bank on the south coast of England, ])y descending to adepth of 60 or 65 feet below the surface of the sea in diving found that after a heavy storm the shingle, which was pre-viously covered with barnacles, was quite free from these shells,proving a movement of the coarse material at a depth of nearly50 feet^^ According to Hermann Fol, whose Impressionsdun Scaphandrier are vividly recorded in the Revue Scienti-fique for 1890^^, a diver at a depth of 100 feet is tossed back andforth by the vigorous oscillatory movement of the bottom waterwhenever groundswells are running on the surface. Hunt quotesthe testimony of pilots and masters to the effect that after awave has broken over a vessel, sand is frequently left on thedecks even when the water has a depth of 75 or 80 feet^^, anddescribes a jar brought up in a trawl from a depth of 220 feetinto which gravel the size of a hazelnut had been washed bywave agitation, Robert Stevenson states that fish disappear 78 THE WORK OF WAVES. DEPTH OF WAVE ACTION 79 from the fishing grounds in the North Sea during storms, dueto the agitation of the water by wave action to a depth of 200feet or more*°. The same authority notes that at the Bell Rocklighthouse, off the east coast of Scotland, large stones, contain-ing upwards of 30 cubic feet and weighing two tons or more,are often thrown upon the rock from deep water by thewaves^^ Thomas Stevenson has made a very interesting com-parison between the depths at which mud reposes on the floorof different parts of the North Sea, and the vigor of wave ac-tion in those places. He finds that there is a direct relationbetween these two phenomena, the depth of the level at whichmud accumulates increasing in much the same proportion as theviolence of the waves. From this we may infer that the upperlimit of mud accumulation is a measure of the maximum depthof wave disturbance in a given locahty. Applying this ruleto the North Sea, we find th
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