Hill Prairie

As glaciers moved down from Canada during the last ice age, they transported limestone sand and gravel in the ice. When the ice melted, rivers on the surface carried the gravel downstream and huge waterfalls deposited it as conical hills called kames. Because the soil in Bluff Spring Fen’s kames is so gravelly, it doesn’t hold moisture well. Therefore, plants that grow here are short and adapted to drought.

See also:
Mesic Prairie