The Uinkaret volcanic field is an active Pleistocene-Holocene volcanic field situated on the north rim of Grand Canyon. The Vulcan's Throne basalt cinder cone formed in the Pleistocene about 73,000 years ago. In the not so distant past, basalt lava flows from Vulcan's Throne and other volcanic vents in the Uinkaret volcanic field spilled into Grand Canyon damming the Colorado River.
Photographer: Dale Nations
Photo Date: circa 1995
Photo Location Accuracy: Known Location
Photo Tags: Uinkaret volcanic field, Vulcan's Throne, cinder cone, volcanism, Grand Canyon, Pleistocene, Holocene, geologic hazard, lava dam, basalt 
