Tassili n'Ajjer

Mainstream archaeology reads Tassili n'Ajjer as a long visual archive of the African Humid Period, when the Sahara was a savannah dotted with lakes between roughly 12,000 and 5,000 years ago. Researchers divide the art into broad phases: an early hunter phase featuring wild fauna, the Round Head paintings of monumental human figures, a long pastoral phase dominated by cattle, and later horse and camel periods that track the region's desiccation. The sequence matches independent climate records from lake sediments and pollen cores, which is why the art is treated as evidence for the Green Sahara rather than as a mystery in need of exotic explanation.

The Round Head figures, for all their strangeness, sit comfortably within human ritual art. Specialists such as Jean-Loïc Le Quellec, a leading French authority on Saharan rock art, note that the bulbous heads, body paint, masks and horned attributes closely resemble masking and body-decoration traditions documented ethnographically in the Sahel and West Africa. Lhote himself was explicit that his Martian label was a joke, and he spent years arguing against the extraterrestrial reading that grew from it. Some of Lhote's team's copies were later shown to be embellished or, in a few cases, outright fabrications by copyists, a scandal that mainstream scholars themselves exposed.

Dating remains genuinely difficult because paint on sandstone rarely preserves datable carbon, so the chronology leans on style, superimposition, weathering and associated archaeology. Most specialists place the Round Heads between about 9,500 and 7,000 years ago, though some argue for older or younger ranges. That honest uncertainty concerns centuries and millennia, not the identity of the painters, whom archaeology consistently identifies as African hunter-gatherers and early pastoralists.