The "Aterian" stone tool technology and cultural group was originally thought to date to the period from 40,000 to 20,000 years before the present. However, more recent scientific technologies have been used to re-examine the stone tools and have pushed back the time horizon for this technology of stone tool making to a much older range: from 85,000 to 40,000 years of age.
This information come from F. Scott Crawford, editor and publisher of the monthly e-magazine "Arrowhead Collecting On The Web".
The full story is here:- http://ezinearticles.com/?What-Are-the-Aterian-Stone-Age-Tools-of-North-Africa?&id=2732444
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