The Humboldt Stages of the Wisconsin Glaciation in Iowa

The Humboldt stages, like the Algona stages consist of a series of recessional moraines some of which are smaller than others, and some of which are poorly defined and irregular or missing in places. They are somewhat concentrically parallel to each other and are disposed at distances varying from two to eight miles apart along a main axial direction which extends southward near the east branch of the Des Moines river from southern Kossuth county to Humboldt, and along the Des Moines river south of Humboldt to Fort Dodge. Toward the places of union with the Gary moraine both eastward and westward the several moraines of this group converge to some extent