USGS banner
Caption below states:
~ Mile 18.5: View of a great sandstone boulder in the Colorado River in Marble Canyon
Next Image Return to Main Page

The URL of this page is: http://3dparks.wr.usgs.gov/2007/grandcanyon/html/grca1037.htm
Maintained by Webmaster, Menlo Park, CA
Last modified: 7/3/2007