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Bighorn Basin

Ecoregion in Rocky Mountains in WY, MT

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The Bighorn Basin lies in the rainshadow of the Beartooth Plateau. It includes some of the driest places in Montana, and parts receive an average of only six inches of precipitation per year. Unleached, nearly white soils commonly occur. These were derived from the underlying Quaternary terrace deposits, Tertiary Fort Union Formation, and Cretaceous

— EPA

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