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This is true "exfoliation." Since it takes a more violent burst of wind to effect this true exfoliation than it does to bring about the adfoliation, and since, further, the snow once indented, will yield to the depth of several layers, the true exfoliation edges are usually thicker than the others: and, of course, they are always to be found on the wind side.
At the line where the two motions join we have that edge the appearance of which suggested to me the comparison with "exfoliated" rock in a previous paper. It is for this particular stage in the process of bringing about that appearance that I tentatively proposed the term "adfoliation." "Adfoliated" edges are always to be found on the lee side of the sheet.
In snow, of course, the origin of this appearance is entirely different; snow is laid down in layers by the waves in the wind. "Adfoliation" would be a more nearly correct appellation of the process. But from the analogy of the appearance I shall retain the more common word and call it exfoliation.
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