Painted hills at Sutton Mountain
The study area, located in central Oregon, as described by the photographer, who visited in June of 2016 (edited for brevity, clarity):
"It is one of those BLM gems that almost no-one outside the local area has heard about. The lower part of the WSA has exposures of the same clay formations that are found in the much smaller but equally spectacular John Day Fossil Beds National Monument, Painted Hills Unit, which lies just across the valley.
"The upper peak of Sutton Mountain itself rises 2,000 feet above the valley with layers of ash and basalt building to the crest. The area is near the John Day River about an hour northeast of Prineville."
Photo credit: Bob Wick / Bureau of Land Management