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Arkansas Valley Hills

Ecoregion on Ozark Plateau, AR

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The Arkansas Valley Hills are underlain by Pennsylvanian sandstone and shale, and are lithologically distinct from Ecoregions 37b and 39. Ecoregion 37c is more hilly than the Arkansas Valley Plains (37d) and less rugged than Ecoregions 36, 37a, and 38. Ultisols are common and support a potential natural vegetation of oak – hickory forest or oak – hickory – pine forest; both soils and natural vegetation contrast with those of Ecoregion 37b. Today, pastureland is extensive, but rugged areas are wooded; overall, trees are much less extensive than in neighboring Ecoregions 36d, 37a, and 38 but more widespread than in Ecoregions 37b and 37d. Poultry operations, livestock farming, and logging are important land uses.

— EPA

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Ecoregion