The principal moraine of this Wisconsin group in Iowa extends from the northeastern corner of Winnebago County in a southwesterly direction, passing just west of Forest City into Kossuth County, in a large rounding curve whose margin is near Irvington south of Algona. This margin swings northwestward from the Des Moines River, crosses into Palo Alto County just north of Whittemore and passes a mile or more north of Medium Lake reaching the west fork of the Des Moines River about a mile north of Osgood. This moraine is much larger in Kossuth and Hancock counties than in the other counties through which it extends.
Proceedings of the Iowa Academy of Science
©1924 Iowa Academy of Science, Inc.
Smith, John E.
"The Algona Recessional Stages of the Wisconsin Till in Iowa,"
Proceedings of the Iowa Academy of Science, 31(1), 339-339.
Available at: https://scholarworks.uni.edu/pias/vol31/iss1/105