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Southern Tertiary Uplands

Ecoregion in TX, LA

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The Southern Tertiary Uplands ecoregion covers the majority of Louisiana’s longleaf pine range west of the Mississippi River. The region of Tertiary geology is more hilly and dissected than the Flatwoods (35f), and soils are generally better drained over the more permeable sediments. Soils are Ultisols and Alfisols with silt loam to loamy sand textures. The Pliocene-age to Eocene-age geology contains a variety of siltstones, sandstones, and calcareous and acidic clays. Historical vegetation was dominated by longleaf pine-bluestem woodlands, but a variety of forest types were present, including shortleaf pine-hardwood forests, calcareous forests, mixed hardwood-

— EPA

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Ecoregion