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Macon Ridge

Ecoregion in LA, AR

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Macon Ridge is underlain almost entirely by Pleistocene glacial outwash deposits that were transported to Arkansas by the Mississippi River and deposited by braided streams. It is veneered by windblown silt deposits (i.e. loess) like Ecoregions 73e, 73g, and 74a. Soils are influenced by loess and contrast with the alluvial soils of Ecoregions 73a and 73h. Macon Ridge (73j) is a continuation of the Western Lowlands Pleistocene Valley Trains (73g) but is better drained, and supports drier plant communities. Its eastern edge is 20 to 30 feet above the adjacent, lithologically and physiographically distinct, Northern Holocene Meander Belts (73a). The western side of Macon Ridge (73j) is lower than the eastern side, and is about the same elevation as the lithologically and physiographically distinct Arkansas/Ouachita River Holocene Meander Belts (73h). Native forest types range from those of better drained bottomlands dominated by willow oak, water oak, and swamp chestnut oak to upland hardwood forests dominated by white oak, southern red oak, and post oak. Prairies and loblolly pine- dominated areas may also have occurred on Macon Ridge (73j). Today, Ecoregion 73j is a mosaic of pastureland, forest, and cropland. Soybeans, cotton, and oats are major crops.

— EPA

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Ecoregion