Paleolithic and Neolithic Art. Engravings on rocks at Niola Doa, Chad Engravings of women with African features adorn the rocks at Niola Doa, not far from the Sudanese border. Near the etched figures are grooves scored into the rock from sharpening tools. For hunting, or farming, one can only speculate as to the way of the ancient people who once occupied this landscape in centuries past.