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Lower Boston Mountains

Ecoregion on Ozark Plateau in OK, AR

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The Lower Boston Mountains ecoregion is a mosaic of woodland, forest, and savanna that contrasts with the denser, moister, and more closed forests of the Upper Boston Mountains (38a). Potential natural vegetation is oak – hickory – pine and oak – hickory forests; pine is much more common than in Ecoregions 38a or 39. Shortleaf pine is especially widespread on drier, south- and west-facing slopes underlain by sandstone. Both precipitation and forest density decrease toward the west, where oak – pine woodland or savanna become common. Ecoregion 38b is underlain by Pennsylvanian sandstone, shale, and siltstone; it is lithologically distinct from the limestone- and dolomite-dominated Ozark Highlands (39). Overall, water quality is quite similar to Ecoregion 38a, which, although generally higher, has similar lithology and land uses.

— EPA

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