Henri Lhote (1903-1991) was a French explorer and ethnologist who is best known for his study of the remarkable cave paintings in the Sahara at Tassili-n-ajjer. Lhote built on the discoveries of a French Lieutenant Brenans, who began exploring the region in the 1930’s.
Some of these depicted masked humanoid figures leading Lhote to suggest that they were evidence of prehistoric extraterrestrial visitors.
One of these was dubbed the ‘Great Martian God’ and a decade later exploited by Erich von Däniken in the promotion of his ‘ancient astronauts’ ideas.
Jürgen Spanuth notes[017.22] that in 1950 Lhote organised an expedition to Tanzerouft in the Sahara with the hope of finding Atlantis although there was no subsequent claim by Lhote of any such discovery. However, Phyllis Young Forsyth quoted Lhote as giving a somewhat contradictory view when he wrote in The Search for the Tassili Frescoes “The fact is that there is no possibility whatsoever of the Sahara having been the site of Plato’s mysterious island.”[442.184] Zhirov, noted[0458.18] that Lhote expressed the view that “it must be admitted that there is much in Plato’s idea that is positive.”
Lhote also contributed an article to the Reader’s Digest’s, The World’s Last Mysteries, regarding the ‘green’ Sahara that existed prior to 2500 BC.
A recent blog(a) by Dale Drinnon expands on some of the numerous examples of Saharan rock art that we know of and their possible connection with Dynastic Egypt.
The Bradshaw Foundation has an extensive archive(b) of African rock art as well as a section on rock art along the Nile(c).
(a) http://frontiers-of-anthropology.blogspot.ie/2011/08/possible-prehistoric-prototype-of.html*(Link broken August 2018)*