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Dry Mid-elevation Sedimentary Mountains

Ecoregion in Rocky Mountains in WY, MT

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The semiarid Dry Mid-Elevation Sedimentary Mountains ecoregion is partially forested and characteristically underlain by Paleozoic sedimentary rock, primarily limestone and dolomite. Average annual precipitation is much less than in the higher mountains to the west and ranges from less than 12 to just over 25 inches. The climax overstory vegetation is primarily mapped as Rocky Mountain juniper, limber pine, subalpine fir, Douglas-fir, and ponderosa pine forests. Large areas of both forest-grassland complex and foothills prairie also occur; much of the vegetation contrasts with that of the neighboring ecoregions. Grazing and logging are the primary land uses.

— EPA

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Ecoregion