That is certainly helpful. Thanks! I did make that mistake. I’d use a generation time of about 15 (at minimum) to 25. So that brings the TMR4C from that table up past 2 mya. Now I see why it helps your case.
However, they are MAX values of samples from a distribution with a very high variance. This is an extreme-value distribution. We need to see the whole distribution. Know any papers with that? Perhaps they can send us their values if we ask them? Perhaps send them an email.
Because of how these numbers are selected, we cannot draw a strong inference from them yet. It is not sound to cherry pick regions with low TMRCA’s, but this study is just cherry picking the ones with high TMRCAs, if it is used this way.
The claim was that Homo sapiens do not dip down to a single couple, and we know this with certainty approaching heliocentrism.
At the time, everyone thought Homo sapiens arose 200 kya, but now there is strong enough evidence that this is no longer the consensus. Some think Homo sapiens arose 300 kya or even as early as 350 kya. If that new finding unsettles Dennis’ claim, then that claim should never have been presented as heliocentrism level certainty. There is no similar sort of evidence we can imagine that would unsettle our view of heliocentrism. The fact that Dennis did not take into account uncertainty in determine the origin date of Homo sapien is part of what is at question here.
To be clear, he certainly is not responsible for excluding evidence published after his book was published. However, that evidence does call into question his heliocentrism certainty, if in fact population bottlenecks between 300 kya and 200 kya are plausible (which we have not yet determined). If that is the case, then part of his certainty rested on false confidence in when humans arise. Of course, if we cannot see plausibility for a bottleneck till say, before, 1 mya, that is not really relevant any ways.
Setting that issue aside, none of the studies I have seen correct for interbreeding. The scientific consensus is that our ancestors never dip to a single couple, not that Homo sapiens never dip to a single couple. It would be really interesting to see the studies that raises Dennis’ confidence so high on this one. He has read the literature more, so he might have seen something I missed.
Just as he corrected me on that TMRCA table, I’d love to have him correct me here too. However, this really does to seem to be a novel claim he is making. I am not even sure I can envision the study that could demonstrate this claim.