Hoodoo formations on the Tunnel Mountain Drive just outside of Banff, Alberta
wiki: "Hoodoos are tall thin spires of rock that protrude from the bottom of arid basins and badlands. They are composed of soft sedimentary rock, and are topped by a piece of harder, less easily-eroded stone that protects the column from the elements. In common usage, the difference between hoodoos and pinnacles or spires is that hoodoos have a variable thickness often described as having a "totem pole-shaped body." A spire, on the other hand, has a more smooth profile or uniform thickness that tapers from the ground upward."