sand sheet

A sand sheet is a geological feature characterized by gently undulating sandy surfaces with low relief. These areas typically have a nearly flat or rippled surface composed of coarse sand grains and range in thickness from a few centimeters to meters. Sand sheets are distinct from sand dunes, which are accumulations of sand shaped into mounds or ridges by the wind.1

Sand sheets are commonly found around the margins of dune fields, though some, like the Selima Sand Sheet in Egypt and Sudan, are extensive. The sand in sand sheets is often poorly sorted and bimodal, meaning it's a mixture of coarse and fine sand particles. These features are formed by wind action, similar to sand dunes, and are found in deserts, on beaches, and in other sandy regions. Understanding sand sheets involves considering the properties of the sand, the wind, and their interaction.1