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Mid-elevation Sedimentary Mountains

Ecoregion in Rocky Mountains in WY, ID, MT

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The carbonate-rich Mid-Elevation Sedimentary Mountains ecoregion is mostly forested and partially glaciated. It is lithologically distinct and less rugged than the neighboring Gneissic-Schistose Forested Mountains (17l) and Absaroka-Gallatin Volcanic Mountains (17i). Ecoregion 17g is characteristically underlain by faulted and folded Mesozoic and Paleozoic sedimentary rocks, including limestone. Stream quality, surficial water availability, and aquatic biota are also different. Average annual precipitation ranges from less than 20 to just over 40 inches. Climax vegetation is mapped as subalpine fir and Douglas-fir forests. Logging, grazing, mining, and recreation are the common land uses.

— EPA

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