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Big Sioux Basin

Ecoregion in SD, MN

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In Minnesota this ecoregion is part of the coteau complex with loess on top of mostly pre-Wisconsin glacial till. Along the northeast border of this region is the Buffalo Ridge, the highest elevation land in southern Minnesota, along most of which windmills have been installed. The ridge is till from the Bemis moraine of the Des Moines Lobe. The soils are mainly loamy, well-drained, moist prairie Udolls farmed with corn and soybeans and some pasture. The former tallgrass prairie matrix was interrupted by wet prairie on outwash in several areas. About 65% of this ecoregion was corn and soybeans and 25% pasture or grassland in 2013.

— EPA

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Ecoregion