Before the Out of Africa theory was generally accepted, there was no consensus on where the human species evolved and, consequently, where modern human behavior arose. Now, however, African archaeology has become extremely important in discovering the origins of humanity. The first Cro-Magnon expansion into Europe around 48,000 years ago is generally accepted as already "modern", and it is now generally believed that behavioral modernity appeared in Africa before 50,000 years ago, either significantly earlier, or possibly as a late Upper Paleolithic "revolution" soon before which prompted migration out of Africa.