Prehistoric Sahara Trails
"The Old Sahara was in fact a cradle of early African civilisation. Far from being a natural barrier between the peoples of West and North Africa, the Old Sahara joined these peoples together. All could share in the same ideas and discoveries.
Many travellers journeyed through the green Sahara in New Stone Age times. They used horses and carts. Ancient rock pictures of these horses and carts have been found along two main trails between North and West Africa. One of these trails passed through Mauretania in the western Sahara, while another went through the central Sahara between the middle section of the Niger River and modern Tunisia. We can be sure that new ideas and discoveries were taken back and forth by these old travellers."
DAVIDSON,B. (1985). A History of West Africa 1000-1800. Longman Group Limited, Essex, England