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Central Hills, Ridges, and Valleys

Ecoregion in Ouachita Mountains, AR

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The Central Hills, Ridges, and Valleys ecoregion is lower, less rugged, and more open than neighboring Ecoregions 36b and 36d. Ecoregion 36c is underlain by folded and faulted sandstone, shale, and novaculite (chert); the lithologic mosaic is distinct from the Athens Plateau (36a). Its forests are codominated by loblolly pine – shortleaf pine and upland oak – hickory – pine forest types. Pastureland is also common, much more so than in Ecoregions 36b and 36d.

— EPA

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