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Purcell-Cabinet-North Bitterroot Mountains

Ecoregion in Rocky Mountains in ID, MT

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The Purcell – Cabinet – North Bitterroot Mountains ecoregion is mantled by volcanic ash and glacial deposits and is underlain by quartzite and argillaceous rocks. Continental ice shaped its terrain but did not extend further south. Potential for natural and management-induced slope instability exists where water tables are perched in compacted tills and glacio-fluvial deposits. However, in general, slopes yield less sediment to streams after disturbance than in nearby granitic and schistic areas. Cedar – hemlock – pine forest and, at higher elevations, western spruce – fir forest occur. Birch and aspen grow on floodplains and are seral species on moist, low to mid-elevation uplands.

— EPA

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