Sahara Sand

30 Jun 2017

Gary Gilligan sent in this link to   ... which concerns his book, 'Extraterrestrial Sands'. The link provides a series of images of sand in the deserts of the world. He points out that from a landscape of lakes and savannah grassland, in the first half of the Holocene period, the Sahara degenerated into a dry and very arid swathe or band that stretched right across North Africa into the Arabian peninsular and even as far as the Thar Desert in India. Where did all that sand come from?