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Beach Ridges and Sand Deltas
Ecoregion
in
ND
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SD
,
MN
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The varying relief of the Beach Ridges and Sand Deltas ecoregion interrupts the extremely flat and intensively farmed land of the Glacial Lake Agassiz Basin (48a). The beach ridges appear as parallel lines, running generally north-south, of sand and gravel formed by wave action on the varying shoreline levels of Glacial Lake Agassiz. A high erosion risk exists in the sand dune areas, and gravel mining has altered the gravelly soils of the beach ridges. Soil types include prairie soils of wet Aquolls, moist Udolls, plus wet, clayey Aquerts, and wet, sandy Aquents. Land use is a mixture of mixed row crops and small grains in several sections, with woody wetlands and deciduous woods dominant in others, all replacing the presettlement vegetation of tallgrass and brush prairie, and aspen stands. About 25% of this ecoregion was wetlands, 20% soybeans, and 10% spring wheat, 9% deciduous forest, 9% other hay crops in 2013.
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