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Dissected High Lava Plateau

Ecoregion in Great Basin in OR, NV, ID, UT

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The Dissected High Lava Plateau ecoregion has alluvial fans, rolling plains, and shear-walled canyons that are cut into extrusive rocks. Sagebrush grassland is common and scattered woodland grows on rocky uplands. Overall, Ecoregion 80a is less wooded, lower, and more arid than Ecoregions 80b, 80c, 80j, or 80k. Ecoregion 80a has more cool season grasses than Ecoregion 13c and lacks the saltbush – greasewood of Ecoregion 80h. Frigid and mesic Aridisols and Mollisols occur. Grazing is the primary land use. Cropland is much less common than in Ecoregions 12a and 12i. Areas of high water quality and native fish assemblages occur in isolated canyons.

— EPA

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