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Western Ouachita Valleys
Ecoregion
in
Ouachita Mountains
,
OK
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The broad Western Ouachita Valleys are etched into Mississippian Stanley Shale and veneered with terrace, alluvial, and colluvial deposits. Ecoregion 36f includes the Kiamichi River, one of the few tributaries to the Red River that has not been heavily impacted by water diversion or major land use changes. The Kiamichi River system is home to more than half of Oklahoma’s mussel species, including eight imperiled or vulnerable species. Natural vegetation is oak – hickory – pine forest on uplands and bottomland forest on floodplains and low terraces. Prairies occurred in Ecoregion 36f prior to the 20th century, but were lacking from the other, more mountainous parts of Ecoregion 36. Today, pastureland, woodland, and hayland are common; poultry, cattle, and hogs are the main farm products.
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