Looking north at interbedded nonwelded ash-flow tuff and rhyolite lava, just west of the mouth of Fish Creek Canyon, part of the Miocene Superstition Volcanic Field, central Arizona.
For other photographs of Superstition volcanics, see Ferguson's photo gallery at http://azgeology.azgs.arizona.edu/archived_issues/azgs.az.gov/arizona_ge...
Photographer: Charles Ferguson