Abstract
-Sediment cores spanning the last 10,000 yr from two lakes in the Sylvania Wilderness Area of the Upper Peninsula of Michigan were analyzed for pollen, and the pollen data were compared with the National Geophysical Data Center (NGDC) data set of modern pollen samples. The best modern analogue for the spruce pollen zone (>9000 BP) at the bottom of Glimmerglass Lake was a sample located near Hudson's Bay in Quebec. This zone was not present at Crooked Lake. Modern samples matched the samples from the diploxylon pollen zone (9000 to 8000 BP) poorly. Samples analogous to those from the haploxylon pollen zone (8000 to 3000 BP) come from eastern Minnesota and western Wisconsin. Samples dating from after the arrival of Tsuga (at 3000 BP) are similar to modern surface samples from Sylvania. The surface sample analogues suggest that the arrival of Tsuga at 3000 BP marks the establishment of the modern lake effects climatic regime in the Upper Peninsula.
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