Rate of Ice Withdrawal During the Last Glacial Epoch in Iowa

Calculated upon the basis of Bruckner climatological cycle of 33 years, the retreat of the Des Moines lobe from its tip to its Keewatin center of dispersion, in Canada, west of Hudson Bay, seems to be reflected in the recessional moraines. The past winter\u27s excessive snows, below-normal temperatures, and long stormy season, displays something of the conditions which would naturally retard for a few years glacier waning, and throw up terminal moraines at the time of the pauses. Only such unusual conditions would be greatly intensified in front of a great ice margin