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Updated: May 1, 2025
It is built each year during November and December, and requires the labor of fifteen or twenty men for about six weeks. It is constructed of river-worn bowlders piled together without adhesive. The top stones are flat on the upper surface, and the dam is a pathway across the river for the people from the time of its completion until its destruction by the freshets of June or July.
In what way can a wind-carved pebble be distinguished from a river-worn pebble? from a glaciated pebble? We have already seen that the ocean is the goal at which the waste of the land arrives. The mantle of rock waste, creeping down slopes, is washed to the sea by streams, together with the material which the streams have worn from their beds and that dissolved by underground waters.
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