Geologic Map of the Boulder Area
Excerpted from "Boulder, A Sight to Behold: Guidebook" (1976) by Donald D. Runnells,
modified by Sheila Murphy.
Graphics adapted from Runnells by Erica J. Keefe.

Simplified geologic map of the Boulder Region. Patterns refer to different ages of rocks.

Additional Geology Information

For more information about geology and mining in the Boulder area, see the BASIN bibliography.

Return to the BASIN Watershed Theme

Thank You! BASIN was a community project which benefitted from over 1000 hours of public volunteer time. BASIN was highlighted by the US EPA in a national case study in its 2001 handbook Delivering Timely Environmental Information to Your Community. Thank you to all volunteers, and especially to the late Jim Waterman, BASIN Project Coordinator!
BASIN was funded through the US EPA EMPACT Program
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Last Page Update - Monday April 23, 2007