View east across Dixie Valley from the crest of the Stillwater Range, western Nevada

View east across Dixie Valley from the crest of the Stillwater Range, western Nevada. In the foreground are igneous rocks of an Oligocene caldera complex; bedrock in the Desatoya Mountains on the horizon is a slightly younger caldera complex. A major challenge for bedrock mapping is inferring what is in the subsurface between exposures like these.