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Central Mountain Ranges

Ecoregion in Ouachita Mountains in OK, AR

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The Central Mountain Ranges are dominated by east-west trending ridges that are characteristically steep and rugged and underlain by resistant sandstone and novaculite (chert). Igneous intrusions occur along with associated hot springs. Rock outcrops, and shallow, stony soils are widespread. Novaculite glades occur. Potential natural vegetation is oak – hickory – pine forest. Perennial springs and seeps are common and support diverse vegetation. Constricted valleys between ridges have waterfalls and rapids. The surface waters of Ecoregion 36b have very low nutrient, mineral, and biochemical water quality parameter concentrations and turbidity. Logging is not nearly as common as in the less rugged Athens Plateau (36a).

— EPA

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Ecoregion