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Pryor-Bighorn Foothills

Ecoregion in Rocky Mountains in MT, WY

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The semiarid, largely treeless Pryor-Big Horn Foothills ecoregion slopes down from the lower mountain treeline to the Montana Central Grasslands (43n). It is typically underlain by carbonate-rich sediments and contains dissected benches and foothills. Many streams originate in the carbonate-rich Dry Mid-Elevation Sedimentary Mountains (43v); their water quality and aquatic biota contrast with that of the Foothill Grassland (42r). Potential natural vegetation is mapped as mostly foothills prairie and is distinct from the forests of the neighboring mountains and the grama-needlegrass-wheatgrass of the nearby plains. Elevations range from about 3,200 to 6,600 feet and are intermediate between those of the drier plains below and the wetter mountains above. Grazing occurs and ranches are common.

— EPA

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