@matttheroman,
You wanna buy a bridge? Who sold you that horseshit? There is absolutely no evidence that the Kensington stone was prepared by any who sailed up the St. Lawrence. People who study history rather than chase after wild conspiracy theories, if they at all believe the Kensington stone to be genuine, are fairly certain that the stone was prepared by Norse and Goths (i.e., Swedes) who were sent by Margaret of Denmark to find the last of the Greenlanders of the western settlement who had not been heard from for years. Those Norse and Goths would have sailed into Davis strait, and if they didn't find anyone in the western settlement of Greenland (which they wouldn't have), then they could have traveled west through what is now called Hudson's Strait, and from there into what is now called Hudson's Bay. From there, it would have been possible to use the river systme draining into James Bay, with some short portages, to reach Minnesota.
Had they traveled up the St. Laurent, they'd have had a hellish portage around the rapids at La Chine--but maybe you can tell me how theywould have gotten past Niagara Falls, never mind reaching Minnesota.
There aren't "certain markings" on it, there's writing on it. Virtually every reputable scholar who has examined the Kensington stone consider it to be a hoax. Those who claim it is real use the lost expedition sent out by Margaret of Denmark in the 14th century as the provenance of the stone, and if that were true, they'd never have gone anywhere near the St. Laurent. Once again, how would they have gotten past Niagara Falls?
Either you, or someone who sold you a bill of goods, made up that **** about Columbus and that phony map.
Jesus, you'll believe anything.