The Cro-Magnon had broad, small faces with pointed chins and high foreheads.
Their cranial capacities were up to 1590 cm A 195,000 year old fossil from the Omo 1 site in Ethiopia shows the beginnings of the skull changes that we associate with modern people, including a rounded skull case and possibly a projecting chin.
A 160,000 year old skull from the Herto site in the Middle Awash area of Ethiopia also seems to be at the early stages of this transition.
It is argued that intermittent contact between people of these distant areas would have kept the human line a single species at any one time.
In addition, some kinds of DNA molecules are known to be more subject to mutation than others, resulting in faster mutation rates.