The origins of the Sahara desert, the largest hot desert dates back to approximately 600 million years ago. The sea swamped the region over and over again, collecting its sediments; whenever it resurfaced, it was covered by forests and savannahs. During that time, trees, such as oaks, cypresses, olive trees and Aleppo pines, grew in the area. Approximately 50-55 million years ago, these lands emerged once and for all and the land started to get dry, as many finds still are announced: shells, trunks now turned into stone after a long silicification process, wall paintings and graffito representing the typical animal life of the savannah.
http://www.eniscuola.net/en/ecosystems/contenuti/desert/left/desert-biome/the-long-history-of-the-sahara/
PHOTO: http://secondglobe.com/item/the-sahara-the-biggest-and-hottest-desert-in-the-world/
http://www.eniscuola.net/en/ecosystems/contenuti/desert/left/desert-biome/the-long-history-of-the-sahara/
PHOTO: http://secondglobe.com/item/the-sahara-the-biggest-and-hottest-desert-in-the-world/