Pikes Peak granite. Denver, Colorado
By Water Resources Mission Area
2005 (approx.)
Detailed Description
Photo of Pikes Peak Granite from USGS Circular 1357 "Water Quality in the Denver Basin Aquifer System, Colorado, 2003 - 2005." Sediments from the Pikes Peak granite have been weathering for millions of years are one source of uranium and radon in the Denver Basin aquifer system.
Sources/Usage
Public Domain.