Ok so poor spelling aside (is it neardertHal or neandertal anyway?), if the above chronology is correct, something happened circa 50,000 years ago that tipped the balance of power in our favor and spelled the doom of neanderthal. Where does this “marked increase in the diversity of artifacts noticeable in north Africa” comes from? How does prehistory accelerate?
This shift is called the Upper Paleolithic Revolution. It corresponds to the divide between the Middle and Upper Paleolithic.
It happens after a period of seeming technological stagnation for Homo sapiens, who appeared circa -190,000 in Africa. That may be an artifact, an illusion, because of a lack of digs and fossiles from much of Africa… Maybe the African sapiens were progressively honing their technologies, unbeknown to us.
Whatever the case, there was also a severe demographic bottleneck 20,000 yr before the upper paleolithic “revolution”. The Toba catastrophe theory suggests that a bottleneck of the human population occurred c. 70,000 years ago, reducing the total human population to c. 15,000 individuals. The theory is based on geological evidence for sudden climate change, volcanic winter like. There’s also genetic evidence of such a demographic bottleneck. All present-day humans trace their male line to a single male (Y-chromosomal Adam) dated at 60,000 to 90,000 years ago.
By -50,000, the climate improved in North Africa. The Mousterian Pluvial was an extended wet and rainy period in the climate history of North Africa. It began around 50,000 years ago, lasted 20,000 years, ending around 30,000 ago (i.e. the precise period during which Homo sapiens gets out of Africa and into Europe).
What is now the Sahara desert supported typical African wildlife of grassland and woodland environments: herbivores from gazelle to giraffe to ostrich, predators from lion to jackal, hippopotamus and crocodile. These conditions would have logically resulted in a significant population increase among Homo sapiens in Northern Africa. That can help explain why sapiens could beat back neanderthal after 50,000: strength in numbers. But it does NOT explain the seeming technological revolution that occured 50,000 yr ago.
The development of more sophisticated tools circa -50,000, for the first time constructed out of more than one material (e.g. bone or antler) and sortable into different categories of functions, is often taken as proof for the presence of behavioral modernity and fully developed language, assumed to be necessary for the teaching of the processes of manufacture to offsprings.
In other words, according to this theory, some fruit of knowledge was eaten by our African ancestors some 50,000 years ago, the fruit of symbolic language, ergo fuller self-consciousness, learning faster, etc.
And that would be why we ended up getting out of our African eden to beat the s..t out of our European cousins.