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Southern Pleistocene Valley Trains

Ecoregion in LA

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The Southern Pleistocene Valley Trains ecoregion is a continuation of the northern valley train regions in Mississippi, Arkansas, and Tennessee. It is composed of scattered small remnants of early-Wisconsin glacial outwash deposits, similar to those of Macon Ridge (73j). This ecoregion, however, has warmer annual temperatures, a longer growing season, and higher annual rainfall. Soils are somewhat poorly and poorly drained Alfisols, Inceptisols, and Vertisols with loamy and clayey surfaces. Some species occur here that are not present in the Macon Ridge (73j) or Western Lowlands Pleistocene Valley Trains (73g) ecoregions to the north in Arkansas. Overcup oak, Nuttall oak, honey locust, elm, water oak, sweetgum, blackgum, and hickory are the most common tree species. This region is generally higher than the adjacent Southern Backswamps (73m) ecoregion and soils are more sandy and better drained than the heavy clay soils of the backswamps. Cropland and pasture is common with corn, soybeans, and cotton as major crops.

— EPA

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