As there is no way of knowing for sure. Yes, there is hard data(fossils)(get it, hard data?) but its all theory as to how it all relates. So yes, have at it.

Really in this case, what differences does it make? south to north, north to south, east to west, etc etc, then consider, so much time as gone by, the forth and back most likely should be added to that. Extinctions, reestablishments, over and over. isolations, then re-establishment. A simple migration is probably long gone.

As I have said, theory is only weak when used in a discussion against realtime hard data(results) Then one has to wonder why someone highly educated would use theory against results? That counterdicts being educated. But indeed theory vs. theory is absolutlely what discussions are made of. This is why academics love theory, its fodder for so much discussions and further theory. Results are so final, you know, like a period at the end of a sentence. Cheers FR

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