Palynology, Quaternary, Farmdalian, Paleoclimatology, Paleocology
Core samples of peat from beneath Wisconsinian loess in Des Moines County, Iowa, were analyzed for pollen. The pollen sequence, dating from 24,900 to 28,720 RCYBP (radiocarbon years before present), was divided into 2 zones based on relative pollen percentages and pollen concentration. Zone B, at the base of the peat, is dominated by Pinus and Picea and is interpreted to represent a closed-coniferous forest, comparable to the modern boreal forest. Zone A, at the very top of the peat, is marked by the decline of Pinus and the increased importance of Picea. This is a regional event which marks the change to the late-glacial Picea forest which was devoid of Pinus.
Proceedings of the Iowa Academy of Science
©1980 Iowa Academy of Science, Inc.
Hallberg, George R.; Baker, Richard G.; and Legg, Thomas
"A Mid-Wisconsinan Pollen Diagram From Des Moines County, Iowa,"
Proceedings of the Iowa Academy of Science, 87(2), 41-44.
Available at: https://scholarworks.uni.edu/pias/vol87/iss2/3