Abstract
The data seem to warrant the conclusion that forests of Abies, Picea, Pinus, and Larix existed in central Illinois for many centuries during the Late Sangamon and Early Peorian periods. Macroscopic remains also show the presence of Larix during the Late Peorian stage. The climate was apparently the same as that of the region in which the northern conifers are now found. This area extends in the north from Labrador and Newfoundland to northern British Columbia and the Yukon, and in the south includes the northern parts of Michigan, Wisconsin, and Minnesota.

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