Hoodoos.

Hoodoos are one of the iconic images of southern Alberta, along with endless fields of canola and the steady rocking motion of a pumpjack. While small hoodoos are common in the badlands around Drumheller, larger ones are a sight to behold.

Formed where a harder type of rock sits atop the softer sedimentary rock below, the cap protects the underlying rock from wind and water erosion, producing a column. A hoodoo that has lost its cap is  vulnerable, as it will undergo accelerated rates of erosion, causing these to be some of the more fragile landmarks.