Answers are grounded in this paper and cite their sources.
Richard B. Brugam, Melody Giorgi, Carmen Sesvold, Stacy Mccance Johnson, Rodney Almos, Holocene Vegetation History in the Sylvania Wilderness Area of the Western Upper Peninsula of Michigan, The American Midland Naturalist, Vol. 137, No. 1 (Jan., 1997), pp. 62-71
No takes yet. Share an insight, caveat, or question.
Brugam et al. (1997) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: