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Grave Creek Range-Nine Mile Divide

Ecoregion in Rocky Mountains, MT

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The Grave Creek Range-Nine Mile Divide ecoregion is composed of northwest- southeast trending, forested mountains that are partially mantled by volcanic ash and underlain by Precambrian argillite, argillaceous rocks, and quartzite. It is more rugged than the Salish Mountains (15l) and has a different topographic orientation than either the wetter Clark Fork Valley and Mountains (15k) or the lithologically distinct Glaciated Bitterroot Mountains and Canyons (16e). Elevations range from about 3,200 to just over 6,500 feet and the average precipitation ranges from about 25 to just over 65 inches per year; maximums are much less than in the St. Joe Schist – Gneiss Zone (15p) to the west. Climax vegetation is mapped as subalpine fir, Douglas-fir, grand fir and ponderosa pine forests and is different than that of the neighboring Clark Fork Valley and Mountains (15k) and Bitterroot-Frenchtown Valley (17s). Logging, mining, and recreation are the common land uses.

— EPA

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