Dennis Stanford
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"Dennis J. Stanford" in Cherokee, Iowa is an archaeologist and Director of the Paleoindian/Paleoecology Program at the National Museum of Natural History at the Smithsonian Institution. Along with Prof. Bruce Bradley, Stanford is known for advocating the Solutrean hypothesis, which contends that stone tool technology of the Solutrean culture in prehistoric Europe may have influenced the development of the Clovis culture/Clovis tool-making culture in the Americas.

More Dennis Stanford on Wikipedia.

The objection has been that people living in the far north couldn't have gotten across the Atlantic because they didn't have boats; that they didn't venture out into the ocean ice. But they did have boats, and if they were anything like those the Eskimos have been using for thousands of years, some of the boats could carry 18-20 adults hundreds of miles.

I don't know. But you're looking at a long distance inland, 100 miles or so, before they would get to caves to do art in.