First Humans: Time of Origin Pinned Down
(Top Posts - Science - 022307)

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By Robin Lloyd
LiveScience Senior Editor
posted: 23 February 2007
01:21 pm ET
http://www.livescience.com/humanbiology/070223_chimp_split.html
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Excerpts:

The lineages of humans and chimpanzees,
our closest relatives, diverged from one
another about 4.1 million years ago, accord-
ing to a new estimate that is said to be far
more precise than previous ranges for this
critical evolutionary moment.

...

The timeline of human evolution is long and
controversial, with significant gaps. Experts
do not agree on many of the start and end
points of various species.

So this chart involves significant estimates.

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The team also came up with a fairly large estimate
for the size of the ancestral population of the pri-
mates just before human and chimp species
evolved from it—about 65,000 individuals. Other
primates would have existed at the time, too, but
not all were ancestors of ours.

...

* Timeline of Human Evolution
http://www.livescience.com/images/060508_human_evolution_02.jpg

...

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