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THE ROLE OF FLOWING WATER. A few tens-of-millions of years ago the Yosemite area was a rolling surface of rounded hills and broad valleys with meandering streams
Figure 7 - THE ROLE OF FLOWING WATER. A few tens-of-millions of years ago the Yosemite area was a rolling surface of rounded hills and broad valleys with meandering streams (A, above). Before the onset of glaciation, more than a million years ago, the elevation of the range increased and streams incised deep canyons into the western flank of the range (B, below).
Before the onset of glaciation, more than a million years ago, the elevation of the range increased and streams incised deep canyons into the western flank of the range

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