What happened 33000 years ago?

Mmiikkii

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For many of us who have been studying haplogroups for a while, you may have noticed just how many of them appeared like 33000 years ago, before the Last Glacial Maximum.

https://www.eupedia.com/europe/european_haplogroups_timeline.shtml
Here you can see that I & J gave birth to their typical subtypes at that time.
N & O too. In fact, if you search for O subgroups you'll find they also appeared like 33k ybp.
Q & R also became differentiated from the K population right before the LGM.


It's something weird, it seems that for all the Aurignacian period(50-30000 years ago). All of those groups were in their infancy.
https://www.eupedia.com/europe/ancient_european_dna.shtml
Take a look at this, you will realize that most haplogroups were C. Or F(from where IJK come from).

Some of them are even of undifferentiated CT. That means before the branches that were to form the bulk of the continent's population(F) on one side,
And the isolated C of steppe nomads and Aboriginals on the other,
Diverged

https://www.eupedia.com/forum/threads/42239-C-hapl-means-you-re-lonely-and-like-open-spaces
Here's a thread on C, the first ones to diverge and "acquire their current form" from within the Eurasian population.

There are some samples that are even BT. There, you can have DE haplotypes, even of "Pigmy origin".
For DE, yet another thread
https://www.eupedia.com/forum/threads/42331-DE-once-populated-Asia


After this unbelievably long diatribe, I summarize.

The first 20000 years after the peopling of Europe, seem to have been populated by very basal haplogroups (CT in general, C & F if we differentiate).
Like 40000 years ago, we see the appearance of J & I, that are important till these days. They even evolve to I1, I2, J1 & J2 over the course of the next 10 thousand years. P(Q & R) also appeared, but unlike IJ, in very basic forms.
But we still see C dominating for all the Aurignacian, as the Goyet cave
and Kostenki remains show.


But then, 33000 years ago, the Last Glacial Maximum starts. And after some 20000 years more, we start the Holocene with the haplogroups that were born before the LGM:
I, J, N, O, Q & R.

This is key. The whole point of this post was to focus on the LGM and how it marked a new era. Not only because the Ice Age ended.
Also for the reshape in the population landscape that took place in the worst of the glaciation.
 

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