sand sheet

…comes from detailed study of sand bodies forming at the present time. One of the clues to origin is the overall shape of the entire sand deposit. Inland desert sands today cover vast areas as a uniform blanket; some ancient sandstones in beds a few hundred metres thick but 1,600…

…low relief are classified as sand sheets. They commonly have a nearly flat or rippled surface of coarse sand grains and are only a few centimetres to metres thick. Minor sand sheets cover only a few square kilometres around the margins of dune fields. A few, such as the Selima…

…virtually all of the Kalahari: sand sheets, longitudinal dunes, and vleis (pans).

Sand sheets and dunes cover approximately 25 percent of the Sahara’s surface. The principal types of dunes include tied dunes, which form in the lee of hills or other obstacles; parabolic blowout dunes; crescent-shaped barchans and transverse dunes; longitudinal seifs; and the massive, complex forms…