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Marble Platform

Ecoregion on Colorado Plateau, AZ

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The Marble Platform ecoregion includes the limestone-capped plateau surface surrounding Marble Canyon as well as House Rock Valley to the west. Elevations range from about 3200 feet near Navajo Bridge in the north to just over 6500 feet on the summit of Shinumo Altar. Desert scrub is typical in the lower northern portions, with some desert grasslands in the higher elevations to the south and west. Livestock grazing has decreased from historical high levels, although cattle and bison herds still occur. Seeps and springs emerge from cliffs near the boundaries with adjacent ecoregions 20e and 23j and provide important water sources for wildlife.

— EPA

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Ecoregion