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Coeur d Alene Metasedimentary Zone

Ecoregion in Rocky Mountains, Bitterroot Range in ID, MT

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The Coeur d’Alene Metasedimentary Zone is forested and underlain by fractured quartzite and argillaceous rock. It is more rugged than Ecoregions 15s, 15u, and 15v and lithologically unlike Ecoregions 15i and 15p. Slope instability and channel sedimentation is usually less than in Ecoregions 15p or 15y but fault crush zones are notably unstable. Douglas-fir, grand fir, western redcedar, western hemlock, and, at higher elevations, mountain hemlock, subalpine fir, Engelmann spruce, and whitebark pine occur. Smelter emissions have denuded some slopes. Acid drainage from mine tailings have left some streams nearly devoid of aquatic life. Massive restoration efforts are now underway.

— EPA

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