Don Barone Wrote:
------------------------------------------------------
>
> * c. 3100 BC: Narmer (Menes) unifies Upper and
> Lower Egypt into one country; he rules this new
> country from Memphis.[1]
> * c. 3100 BC: Narmer, pharaoh, rules (other
> dates are 3150 BC–3125 BC).)
> * c. 3100 BC: Predynastic period (Neolithic)
> ends in Ancient Egypt (other date is 3150 BC).
> * c. 3100 BC: Early Dynastic (Archaic) period
> starts in Ancient Egypt (other date is 3150 BC).
> * c. 3100 BC: The first temple of Tarxien is
> in use by the Neolithic inhabitants of Malta[1].
> * c. 3100 BC: First stage in the construction
> of Stonehenge.)
> * c. 3100 BC – 2600 BC: Skara Brae, Orkney
> Islands, Scotland is inhabited. Discovered 1850.)
> * c. 3100 BC: Anu Ziggurat and White Temple in
> Uruk, Mesopotamia (modern Warka, Iraq) are
> built.)
> * c. 3100 BC: Humans develop a writing system,
> cuneiform script.
>

It says "circa." Could mean anything else with an error margin of plus or minus 10% (100 to 200 years.) To my mind there's a big difference between 3209 and 3100 or 3100 and 3030... etc. No exact dates are given on any of those.

-- Byrd
Moderator, Hall of Ma'at