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Semiarid Benchlands and Canyonlands

Ecoregion on Colorado Plateau in AZ, UT, CO, NM

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Broad, grass-, shrub-, and woodland-covered benches and mesas characterize the Semiarid Benchlands and Canyonlands ecoregion. Areas of high relief alternate with areas of low relief. Low escarpments separate remnant mesa tops and narrow canyons from surrounding benches. In Arizona, elevations range mostly from 5000 to over 7300 feet, higher than those of adjacent ecoregions 20d or 20i. Bedrock exposures (e.g., slickrock and fins) are common along rims, escarpments, and on steep dip slopes. Deep eolian soils are composed of fine sand and support warm season grasses, winterfat, Mormon tea, fourwing saltbush, and sagebrush. Pinyon and juniper occur on shallow, stony soils. Scattered areas of Gambel oak occur at higher elevations. Fire suppression and erosion have allowed this woodland to expand beyond its original range. The vegetation is not as sparse as in drier areas such as Ecoregions 20d, 20h, and 20i. Annual precipitation in the Arizona portion varies from 8 to 16 inches. Livestock grazing, recreation, and wildlife habitat are dominant land uses.

— EPA

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