
Radiocarbon Dating of Basal Peats Supports Separation of Lake Superior from Lakes Michigan-Huron about 1250 years ago
Yu S-Y, Colman SM & Milne GA
Earth and Planetary Science Letters, vol. 375, 319-325, 2013https://doi.org/10.1016/j.epsl.2013.05.051
Research paper from the PAGES PALSEA working group.