Pretty funny hey? Claiming that the vikings couldnt have traveled the great lakes because the lakes were not there.
When the vikings traveled the great lakes, it would have been the 14th century..or earlier if Vinland is considered a advanced point of exploration for them.
The Great lakes had fully formed by then.
How effn dumb can so called “experts” be?
BTW, maybe they better consider the copper mining done around the Keweenaw peninsula and explain how that type of copper got to the mid eastern area of the world. WAY before the Vikings were thought of. To pick up that float copper the glaciers would have had to have brought it to that area first. Then the lakes filled from the ice melt creating an avenue for them to sail up and get that copper.
Better yet, There is an ancient native canoe trading route from the Lake Superior to Hudson bay in the summer. When the fur traders first started to use this the natives told them that it had been there forever and that they were not the first white people who had come there to use it. This would have absolutely been viable and available to the Vikings too.
I have personally followed this route using Google Earth to confirm.
http://frontierbushcraft.com/expeditions/missinaibi-river-canoe/