Candescent Canyon Located in northern Arizona, this narrow, dark canyon known as a slot canyon, cuts through 200 million year old rock on its journey to the Colorado River. The colors form naturally and change in minutes from sunlight reflecting dozens of times as it cascades to the bottom of this sandstone crevasse. Sudden flash floods that reach depths of 50 feet or more in minutes re-sculpture the walls and floor so that each exploration can be a new experience.