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Northern Cross Timbers

Ecoregion in OK, KS

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A dense growth of blackjack oak, post oak, and oak savanna blankets the sandstone hills of the Cross Timbers, separating this region from the tallgrass prairies of the Flint Hills, and the mosaic of oak-hickory forest and tallgrass prairie of the Osage Cuestas to the east. Thick sandstone-capped uplands with shale outcrops are common. Soils tend to be sandier, somewhat shallower, and drier than in surrounding regions. Woodland and rangeland are the predominant land cover/land use of this region, a change from the cropland/grassland mix that occurs to the east and the more extensive rangeland found in the Flint Hills (28) to the west.

— EPA

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Ecoregion