United States Geological and Geographical Survey of the Territories (Hayden). Pikes Peak from Colorado City. Colorado Territory, August 13, 1869. Public Domain plate from US Geological Survey.
|Precambrian rocks of the Pikes Peak Batholith exposed at Cathedral Park along Gold Camp Road.|
Signal Butte, an igneous intrusive mass of Tertiary age located in the “middle” of the Precambrian Pikes Peak granite.