“My point is - and was - that it’s my understanding that Homo Sapien fossils go back just 200,000 years. If that’s correct, someone needs to explain how the Homo Sapien “Adam” can be dated at 320,000 years in one study, and 500,000 years in a different study.”
My point was that the mention of 500,000 was not sourced and was not defended by the article. As for dating I provided a source and the first paragraph. Please read the rest of the section on “Estimates”.
Estimates[edit]
Current (as of 2015) estimates for the age for the Y-MRCA are roughly compatible with the estimate for the emergence of anatomically modern humans some 200,000 years ago (200 kya), although there are substantial uncertainties.
http://en.wikipedia.org/wiki/Y-chromosomal_Adam
And 100kya, the population of the planet (HSS) was less than 10k people, as the ice age ground on.
Hmmm.