[ml/nj]

With as many people roaming the continent as is implied, you’d think that we’d run across some of the remains.

I'm not sure why this implies "many people roaming the continent." Maybe they were mostly visitors. See America B.C. (Here B.C. means Before Columbus) by Barry Fell.

ML/NJ

[dhs12345]

I thought that they might have come by way of Alaska. Interesting that they might have come from the Atlantic and only visiting.