During the great Norse expeditionary period from 900-1100 AD, high temperatures in the Northern Hemisphere melted away much of the Arctic ice north of Canada.
At least one Viking ship may have sailed through the Northwest Passage there and down through the Bering Strait, though the prevailing east winds in the Arctic guaranteed that the adventurers would never make it back to Scandinavia.
It all started when my and I were on one of our extended expeditions in the desert headed toward his home in New Mexico from the High Sierras.
We had cut through Death Valley, Baker, Nipton and into Searchlight, Nevada when he decided rather than crossing the Colorado River over Hoover Dam by turning north, we would instead, vere south and parallel the river toward Yuma.
In a general chit-chat sort of way about the Colorado River floods, citing my major source of information in my early days, comic books, I told my uncle that I had once read a great story in a Gene Autry comic called "The Ship in the Desert" (issue #52, June 1951) and later an even better one in an Uncle Scrooge comic called The Seven Cities of Cibola (issue #7, September 1954) wherein a wrecked Spanish galleon had been found in the desert and that both stories, as near as I could remember, were associated with an old Colorado River channel covered and uncovered by flash floods or some such thing leading to the Salton Sea.