The climate of the glacial boundary during the Wisconsin maximum was generally cooler and moister than at present. There is some evidence that a frost climate prevailed for some time at the glacial margin, suggesting that a tundra-like vegetation existed there. Pollen profiles indicate that a Picea-Abies forest existed south of the glacial margin and probably extended up to it during periods of climatic amelioration.
Proceedings of the Iowa Academy of Science
©1963 Iowa Academy of Science, Inc.
Eilers, L. J.
"The Vegetation of the Glacial Border During the Wisconsin Maximum,"
Proceedings of the Iowa Academy of Science, 70(1), 60-64.
Available at: https://scholarworks.uni.edu/pias/vol70/iss1/13