The red rocks of Red Rocks belong to the Fountain Formation, a set of coarse-grained conglomerate and sandstone beds that is also well exposed in the Garden of the Gods, the Boulder Flatirons and Red Rock Canyon elsewhere in Colorado. They formed as an early version of the Rocky Mountains rose, shedding their gravelly sediment in the oxygen-rich atmosphere of Pennsylvanian times, nearly 300 million years ago. Iron oxides and pink feldspar grains give the stone its color. The Fountain Formation lies directly upon the ancient granite and gneiss that gave rise to its sediment.
|Front Range Hogbacks||Ship Rock||Fountain Formation North of Red Rocks||Red Rocks Unconformity|
|Fountain Formation Arkosic Conglomerate||Precambrian Gneiss|
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