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San Antonio Prairie

Ecoregion in TX

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The San Antonio Prairie is a narrow, 100-mile long region occurring primarily on the Eocene Cook Mountain Formation. Soils of Ecoregion 33c are mostly Alfisols, with some Vertisols, and Mollisols. Generally, there are fewer Vertisols compared to the Northern Blackland Prairie ecoregion (32a) to the west. Upland Alfisol prairies were dominated by little bluestem and yellow Indiangrass and contained a different mix of grasses and forbs than the dark, clayey, more calcareous Vertisols of Ecoregion 32a. Since the 1830’s, settlement clustered along the Old San Antonio Road (State Highway 21 in the south, Old San Antonio Road in the north) within this narrow belt of prairie land. Currently, land cover is a mosaic of woodland, improved pasture, rangeland, and some cropland.

— EPA

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