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Some of the mountain slopes, especially the windward slope (north slope), were forested in the past.

The alluvial plain at piedmont is composed of Alluvial fans which can be found in this area, and which are located at the foot of the rocky mountains.

The size of this belt depends on the amount of runoff and weathering materials from the rocky mountains.

Old alluvial fans are covered with eolian loess.

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