Side A Northern Iowa landforms result from the action of 3 separate glacial ice sheets. Clear Lake, south of here, is one of the many Iowa lakes formed by glacial action. Pilot Knob, a glacially formed hill west of here, is one of highest points in northern Iowa and was used as a landmark by early travellers.
Much of the Western two-thirds of Iowa was prairie when the first settlers arrived. Pioneers in this area travelled through grasses 5 to 7 feet tall. Many of them referred . . . — Map (db m23264) HM