Sand with a muddy consistency that has been rapidly dried by the sun, giving a potsherd appearance to the cracked and broken surface layer.
Unusual sand dune.
Published
Sand with a muddy consistency that has been rapidly dried by the sun, giving a potsherd appearance to the cracked and broken surface layer.
David A Lockwood 
That sure is an unusual looking dune!
Yes unusual getting this on a slope, usually it’s shallow pools that dry rapidly.