[sawsalimb]

As plausible an explanation as any other.

[general_re]

I think accidental landing is probably the most plausible explanation also. There was a sunken Roman galley discovered off the coast of Brazil some years ago, so there's certainly precedent for such a thing. What seems unlikely is that there was any regular, culturally significant contact between the Old and New worlds in ancient times, the claims of the Afrocentrists notwithstanding.