Geologically, Bryce Canyon National Park is part of what is known as "The Grand Staircase". This enormous sequence of rock stretches all the way from Bryce Canyon, through Zion National Park and into the Grand Canyon. The Grand Staircase preserves more of Earth's history in its layers of sedimentary rock than any other place on Earth.

Ice and rainwater shaped the richly colored limestone "hoodoos", arches, fins and walls that make Bryce Canyon such an amazing landscape. The "Canyon" isn't really a canyon at all as it was not formed by running water, rather weathering and erosion by freezing, and thawing, and slightly acidic rainwater slowly dissolving the limestone.

Source

• http://www.npca.org/parks/bryce-canyon-national-park.html