This was the title panel of an outreach product that told the story of mapping Holocene deposits of the San Pedro River Valley. The geotechnical report and multiple maps of Holocene deposits from the US-Mexico frontier to Winkelman, Arizona, are available for download
http://repository.azgs.az.gov/uri_gin/azgs/dlio/799
Keyword: San Pedro River Valley Author : Cook
Photographer: Joseph Cook
Photo Date: circa 2011