Great unconformity, Grand Canyon, AZ

sedimentary, Grand Canyon National Park, desert, stair-step topography, erosion, strata

Angular Unconformity, Grand Canyon (Pan)

sedimentary, Grand Canyon National Park, desert, red beds, strata

Angular Unconformity, Grand Canyon

sedimentary, Grand Canyon National Park, desert, red beds, strata

Nonconformity: Ash flow tuff on metamorphics

unconformity, ignimbrite

Nonconformity. SW Montana

depositional contact, sedimentary, metamorphic, unconformity

Buttress Unconformity, northern Arizona

Buttress Unconformity

Buttress Unconformity, northern Arizona. In buttress unconformities, the younger material
is deposited against the older material, resulting in the apparent truncation of the younger rock. On
closer inspection, however, one can see erosional features along the contact to indicate its depositional
origin. (ID SrU-25)

Nonconformity, Utah

Precambrian-Cambrian Nonconformity

Tintic Quartzite, unconformity, strata

Faulted angular unconformity (pan)

Faulted angular unconformity

Nonconformity, Teton Range, Wyoming

Precambrian-Cambrian Nonconformity

unconformity