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The Springfield Plateau is the only Ozark Highland Level IV ecoregion within all four states. [1] The nearly level to rolling Springfield Plateau is underlain by cherty limestone of the Mississippian Boone Formation and Burlington Limestone; it is less rugged and wooded than Ecoregions 38, 39b, and 39c, and lacks the Ordovician dolomite and limestone of Ecoregions 39c and 39d.
The Central Great Plains are a prairie ecoregion of the central United States, part of North American Great Plains. The region runs from west-central Texas through west-central Oklahoma, central Kansas, and south-central Nebraska. It is designated as the Central and Southern Mixed Grasslands ecoregion by the World Wide Fund for Nature.
Subdividing the Eastern Temperate Forests, Arkansas is split among three Level II ecoregions: the Southeastern Plains, Ozark, Ouachita, Appalachian Forests, and the Mississippi Alluvial and Southeast USA Coastal Plains. Level III subdivides the continent into 182 ecoregions; of these, seven lay partly within Arkansas's borders.
Western Corn Belt Plains: 9.2.4: Central Irregular Plains 9.3: West-Central Semi-Arid Prairies 9.3.1: Northwestern Glaciated Plains 9.3.3: Northwestern Great Plains
The Northern Pleistocene Valley Trains ecoregion is a flat to irregular alluvial plain composed of sandy to gravelly glacial outwash overlain by alluvium; sand sheets, widespread in the St. Francis Lowlands (73c), are absent. The Pleistocene outwash deposits of Ecoregion 73b are usually coarser and better drained than the alluvial deposits of ...
The Arkansas Valley is a Level III ecoregion designated by the Environmental Protection Agency (EPA) in the U.S. states of Arkansas and Oklahoma.It parallels the Arkansas River between the flat plains of western Oklahoma and the Arkansas Delta, dividing the Ozarks and the Ouachita Mountains with the broad valleys created by the river's floodplain, occasionally interrupted by low hills ...
More specifically, the Cross Timbers fall into Level II Ecoregion 9.4, the smaller South Central Semi-Arid Plains. [7] In southern Oklahoma, the Cross Timbers are located on the very edge of the Great Plains, as they border directly parts of Level I Ecoregion 8.0, the Eastern Temperate Forests; elsewhere, the Cross Timbers are separated ...
The dissected irregular plains and gently rolling low hills of the Southern Hilly Gulf Coastal Plain ecoregion developed over diverse east–west trending bands of sand, clay, and marl formations. Broad cuestas with gentle south slopes and steeper north-facing slopes are common, and the heterogeneous region has a mix of clayey, loamy, and sandy ...