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Big Snowy-Little Belt Carbonate Mountains
Ecoregion
in
Lewis & Clark NF
,
Rocky Mountains
in
MT
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The forested Big Snowy-Little Belt Carbonate Mountains ecoregion lies east of the Rocky Mountain Front where the climate is drier and more continental than the more westerly parts of the Northern Rockies (15). Ecoregion 17q is characteristically underlain by Paleozoic and Mesozoic limestone, dolomite, sandstone, and shale. Generally, it is lithologically distinct from the Scattered Eastern Igneous-Core Mountains (17r), and related stream quality, surficial water availability, aquatic biota, and soils are also different. The climax vegetation is mapped as subalpine fir, Douglas-fir, and ponderosa pine forests in the western and central Little Belt Mountains and spruce and Douglas-fir forests in the Big Snowy Mountains and easternmost Little Belt Mountains. Logging, mining, and recreation are the principal land uses.
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EPA
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Ecoregion
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