jillery wrote:
> According to the Out of Africa (OOA) model of modern human origins,
> anatomically modern humans originated in Africa and then spread across
> the rest of the globe within the past ~100,000 years (202).
How long did it take? Because humans are widely varied in appearance now,
and appearance is all you're going by.
Literally.
But, "Anatomically Modern" doesn't even mean that a single member of our
genus living 100k years ago could pass for a "Modern" human today. It just
claims that traits fell within a range seen in modern humans.
> 2. modern non-Africans evolved from a genetically restricted slice of
> that African diversity more recently.
Actually, BILLIONS of people walking around right now preserve the evidence
of the "Mitochondrial Eve" far older than the one in the Out of Africa purity
model, and it's Eurasian in origins. This far older than your "past 100k~" and
actually supposed the argument that your "Out of Africa" population was
itself descended from a far earlier Eurasian group.
Well. Potentially Melanesian. But you get the point.
Sticking with YOUR dating, YOUR argument, you have to be wrong. The origins
had to be outside of Africa.
> Your "waterside hypothesis" doesn't account for this distinction.
Actually it explains it perfectly.
"Waterside" aka "Littoral" aka "Aquatic Ape" and even aka "Coastal Dispersal"
says that we had ancestors exploiting the sea. They sort of combined hunting
and gathering into one, picking up shellfish -- living animals, so to speak --
and scavenging beached.. anything.
They ate and moved on.
Occasionally groups pushed inland for various reasons, this happening with
regular frequency and greater necessity once our present Quaternary Period
began, our present ice age.
The breaking off and pushing inland would have started almost immediately,
and probably account for the rise of apes altogether.
Some of the earlier break away groups, from our perspective, would have
been Ardi and Lucy. Some of the last would have been the peopling of the
Americas, where the first were to arrive along the coast only to eventually
push inland.
Adaptation by break away groups was probably helped along by interbreeding
with the descendants of groups that had pushed inland earlier.
There was likely bottlenecks, the chromosome fusion being amongst the
most recent, putting the brakes on interbreeding with more "Primitive"
forms and resetting this whole process... which just started all over again
giving rise to our immediate ancestors, such as Neanderthals and
Denisovans.
So Aquatic Ape, Waterside (etc) explains your "fossil record" AS WELL AS
the things you left out, AND the DNA evidence AND explains how brains
dependent upon DHA could evolve under circumstances where, IN YOUR
CASE, it just didn't exist, but exploiting marine resources granted it in
great abundance.
So the good Doctor explains everything and you have to leave out entire
tomes worth of facts & evidence to make your model of human evolution
work at all.
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https://jtem.tumblr.com/post/714267256849301504