Backcountry travel in Grand Canyon to collect groundwater samples
By Communications and Publishing
February 2018 (approx.)
Detailed Description
USGS scientist Joel Unema hikes to National Canyon Spring to collect groundwater samples from a remote location near the south rim of the Grand Canyon. Joel Unema was part of a group of USGS and National Park Service scientists that rafted 150 miles in nine days to better understand natural resources.
Sources/Usage
Public Domain.