Lives of the Hoodoos
Hoodoos don’t grow like trees but are eroded out of cliffs where rows of narrow walls form. These thin walls of rock are called fins. Frost-wedging enlarges cracks in the fins, creating holes or windows. As windows grow, their tops eventually collapse, leaving a column. Rain further dissolves and sculpts these limestone pillars into bulbous spires called Hoodoos. The delicate climatic balance between snow and rain ensures that new hoodoos will emerge while others become reduced to lumps of clay.
About 18- days a year temperatures swing widely between freezing nights and warm afternoons. The combination of gravity and meltwater causes soil creep, moving the stone fragments downhill. Rain from summer thunderstorms further dissolves the limestone into a clay ooze and generates just enough flowing water to help remove the debris.