Sentence:  The Cro-Magnons may have been one important step beyond the Neanderthals in social organization....That the <WSD>Cro-Magnons</WSD> and the Neanderthals encountered each other is probable. There seems to be no more than a five-thousand-year interval between the  general occupation of home sites by the Neanderthals and their replacement by <WSD>Cro-Magnon</WSD> tools and fossils. 
Meaning of the word marked with <WSD> tags:  The earliest known form of modern human ("Homo sapiens") in Europe, dating from the late Paleolithic.