Introduction•One of US physiographic divisions.•Rock on the Horizon•“Rockies”•Broad mountain range•Rocky Mountain System
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Geologic Events•Southern mountains uplifts during thePrecambrian period.•Younger ranges of the Rocky Mountainsuplifted during the late Cretaceous period.•Series of pulses of uplift over million years.•Erosionupturned layers of sedimentaryrocks.
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Geological Features•Severe erosions transformedintermountain basins into a relatively flatterrain.•Great Plains on the east.•Broad basins and plateaus on the west.•Mountains form the Continental Divide•Mountain folds and ranges separated byvalleys.
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Geological Features•Mountain fold separating rivers draining tothe lakes and oceans.•Uplifted and dissected lava sheetscrowned with a few dissected volcanoes.•Geysers and Hot springs.
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