Sahara - Climate | Britannica
Sahara - Sahara - Climate: The age of the Sahara has been a matter of some dispute. Several studies of the rocks in the region indicate that the Sahara became established as a climatic desert approximately 2–3 million years ago, an interval that spanned from the late Pliocene to the early Pleistocene Epoch. The discovery of 7-million-year-old dune deposits throughout northern Chad in 2006 ...