Quaternary basalt flow of the Uinkaret Volcanic field and the Colorado River, Grand Canyon National Park, Arizona. Cambrian sedimentary rock of the...
Vulcan's Forge, an eroded Pleistocene volcanic neck in the Colorado River in Grand Canyon National Park. Cliffs in the background consist of Cambrian...
Quaternary basalt lava flow of the Uinkaret Volcanic field spilling into the canyon of the Colorado River, Grand Canyon National Park, Arizona....
Ancestral Puebloan granaries at Nankoweap and the Colorado River, Grand Canyon National Park, Arizona.
Colorado River and Paleozoic stratigraphy from Muav Limestone up through the Kaibab Limestone, Grand Canyon National Park, Arizona.
Angular unconformity between tilted Proterozoic Unkar Group and overlying flat-lying Paleozoic sedimentary rock, Grand Canyon National Park, Arizona.
Travertine-covered rock and dissolved calcium carbonate in the Little Colorado River, Grand Canyon National Park, Arizona.
Colorado River and Paleozoic stratigraphy from Muav Limestone up through the Kaibab Limestone, Grand Canyon National Park, Arizona.
Travertine-covered rock and dissolved calcium carbonate in the Little Colorado River, Grand Canyon National Park, Arizona. Cliffs in the background...
View downstream to Kaibab Trail Suspension Bridge near Phantom Ranch, Grand Canyon National Park, Arizona.
Cretaceous Granodiorite of the Alabama Hills and Sierra Nevada Range. Mt. Whitney in the right background..
Cretaceous Granodiorite of the Alabama Hills and Sierra Nevada Range. Mt. Whitney in the right background..
River-cut notch in low cliffs along shoreline. Colorado River in Grand Canyon National Park, Arizona.
Great unconformity. Nonconformity between Cambrian Tapeats Sandstone overlying steeply foliated amphibolite of the Proterozoic Brahma Schist. Note...
Quaternary basalt flow of the Uinkaret Volcanic field overlying Colorado River gravel next to the Colorado River, Grand Canyon National Park, Arizona.
Quaternary basalt lava flow of the Uinkaret Volcanic field spilling over the rim and into the canyon of the Colorado River, Grand Canyon National...
Colonnade and irregular entablature of Quaternary basalt flow of the Uinkaret Volcanic field, Grand Canyon National Park, Arizona. Note the Colorado...
Fluting of granitic rock caused by weathering and erosion along the Colorado River, Grand Canyon National Park, Arizona.
Quaternary basalt flow of the Uinkaret Volcanic field and the Colorado River, Grand Canyon National Park, Arizona. Cambrian sedimentary rock of the...
Quaternary basalt lava flow of the Uinkaret Volcanic field showing irregular entablature and the Colorado River, Grand Canyon National Park, Arizona.
Granitic dikes and Vishnu Schist, two of the main components of the Grand Canyon basement. Note the flat-lying Tapeats Sandstone at the top.