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By Richard Hereford

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Additional info for Late Holocene alluvial geomorphology of the Virgin River in the Zion National Park area, southwest Utah

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This channel was active until about 1926 when sediment began to accumulate on point bars and along the channel margin in straight reaches. Alluvium of the modern terrace is relatively thin, although the surface area of the terrace is large, as it occupies a substantial portion of the earlier historic-age channel (Figs. 5, 9). The terrace forms point bars (Fig. 7) in wide reaches of East Fork and Virgin River downstream of the forks and flood-plain–like surfaces on both sides of the channel in relatively narrow 38 R.

Photographs taken in the late 1930s (Figs. 19A, 22) indicate that some relief had developed in the channel through deposition of channel bars and other mostly transient depositional features. These were the incipient deposits of the modern alluvium. Contemporary photographs show that the channel has stabilized relative to early conditions. The braid-like pattern of the historic-age channel was replaced by a locally meandering channel having a recently active flood plain, which is the modern terrace along with a well-developed woodland of cottonwood and other riparian vegetation.

1927, Reminiscences of Samuel Wittwer: Springdale, Utah, Zion National Park, manuscript on file. Woolley, R. S. Geological Survey Water-Supply Paper 994, 128 p. A.

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