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Images of Unconformities
Unconformities are buried erosion surfaces. In other words, a series of rocks were exposed to erosion, rock was removed, and sedimentation later covered the surface. In general there are three kinds of unconformities: Nonconformities, in which the underlying rocks are metamorphic or igneous instead of sedimentary; Angular Unconformities, in which the underlying rocks are tilted sedimentary layers; and Disconformities, in which the underlying sedimentary layers have not been tilted. Disconformities are the most difficult to visualize because they don't look much different than a normal sequence of sedimentary layers. Unconformities can represent a profound amount of geologic time. In parts of the Grand Canyon, one can lay a hand on the passage of more than a billion years...
Images of Angular Unconformities
Angular Unconformity at Rainbow Basin, CA Barstow syncline in Rainbow Basin, Mojave Desert, CA Angular unconformity at Box Canyon near Ouray CO Angular unconformity at Box Canyon near Ouray CO Angular unconformity at Box Canyon near Ouray CO Angular Unconformity at Montana del Oro State Beach, California
Angular unconformity in Rainbow Basin, Mojave Desert, CA Angular unconformity in Rainbow Basin, Mojave Desert, CA Angular unconformity at Box Canyon near Ouray Colorado Angular unconformity at Box Canyon near Ouray Colorado Angular unconformity at Box Canyon near Ouray CO Angular Unconformity at Montana del Oro State Beach, California
Angular unconformity from the South Rim of Grand Canyon Angular unconformity from the South Rim of Grand Canyon Angular unconformity from the South Rim of Grand Canyon Angular unconformity from the South Rim of Grand Canyon Angular unconformity from the South Rim of Grand Canyon Angular unconformity from the South Rim of Grand Canyon
Angular unconformity from the South Rim of Grand Canyon Angular unconformity from the South Rim of Grand Canyon divides overlying Paleozoic sediments from underlying Late Proterozoic sediments Angular unconformity from the South Rim of Grand Canyon Angular unconformity from the South Rim of Grand Canyon Angular unconformity and Cambrian island from the South Rim of Grand Canyon Angular unconformity from the South Rim of Grand Canyon
Angular Unconformity from Angels Window on North Rim of Grand Canyon Angular unconformity at Grand Canyon Angular Unconformity from Angels Window at Grand Canyon Angular unconformity in the Grand Canyon Angular unconformity from the South Rim of Grand Canyon Angular unconformity from the South Rim of Grand Canyon
Angular Unconformity in Proterozoic rocks from Angels Window at the North Rim of Grand Canyon Angular Unconformity in Proterozoic rocks from Angels Window at the North Rim of Grand Canyon Angular Unconformity in Proterozoic rocks from Angels Window at the North Rim of Grand Canyon Angular Unconformity in Proterozoic rocks from Angels Window at the North Rim of Grand Canyon Angular unconformity from the South Rim of Grand Canyon Angular unconformity from the South Rim of Grand Canyon
Barstow syncline in Rainbow Basin, Mojave Desert, CA Barstow syncline in Rainbow Basin, Mojave Desert, CA Angular Unconformity at Montana del Oro State Beach, California Angular Unconformity in Mosaic Canyon, Death Valley    
An angular unconformity  atop the Barstow syncline in Rainbow Basin, Mojave Desert, CA  An angular unconformity, syncline, and fault at Barstow syncline in Rainbow Basin, Mojave Desert, CA Angular Unconformity at Montana del Oro State Beach, California Angular Unconformity in Mosaic Canyon, Death Valley    
Images of Nonconformities
Nonconformity in the Grand Canyon Tilted nonconformity in the Grand Canyon Nonconformity in Unaweep Canyon, Colorado The Great Unconformity at Frenchman Mtn    
Tilted nonconformity in the Grand Canyon. Late Proterozoic sedimentary layers on top of Early Proterozoic metamorphic rocks Tilted nonconformity in the Grand Canyon. Late Proterozoic sedimentary layers on top of Early Proterozoic metamorphic rocks Nonconformity in Unaweep Canyon, Colorado. Gentle vegetated slopes are composed of horizontal Mesozoic sediments atop cliffs of Proterozoic metamorphic rocks A tilted nonconformity between Cambrian sediments and early Proterozoic metamorphic rocks at Frenchman Mtn, Las Vegas, NV    
Nonconformity at Colorado National Monument Nonconformity at Red Canyon in Colorado Naitonal Monument Nonconformity at Red Canyon in Colorado National Monument. Rocks beneath the red cliff are metamorphic. Nonconformity at Grandview Pt in Colorado NM Nonconformity in Black Canyon of the Gunnison in Colorado Joint patterns in cliff at Black Canyon of the Gunnison National Par
Nonconformity at Red Canyon in Colorado National Monument. Rocks beneath the red cliff are metamorphic. Nonconformity at Red Canyon in Colorado National Monument. Rocks beneath the red cliff are metamorphic. Nonconformity at Red Canyon in Colorado National Monument. Rocks beneath the red cliff are metamorphic. Nonconformity at Grandview Point in Colorado National Monument. Mesozoic sedimentary rocks on top of Proterozoic metamorphic rocks Nonconformity in Black Canyon of the Gunnison in Colorado. Gentle vegetated slopes are composed of horizontal Mesozoic sediments atop Proterozoic metamorphic rocks Nonconformity in Black Canyon of the Gunnison in Colorado. Gentle vegetated slopes are composed of horizontal Mesozoic sediments atop Proterozoic metamorphic rocks
Nonconformity in Blacktail Canyon, Grand Canyon NP Nonconformity in Blacktail Canyon, Grand Canyon National Park        
Nonconformity in Blacktail Canyon, Grand Canyon National Park Nonconformity in Blacktail Canyon, Grand Canyon National Park        
           
           
Images of Disconformities
Horizontal Paleozoic Layers at Grand Canyon, with numerous unconformities Disconformities at Nankoweap, Grand Canyon Horizontal Paleozoic rocks at Grand Canyon Disconformities at the Transcept at the North Rim of Grand Canyon Horizontal Paleozoic strata at Bright Angel Creek on the North Rim of Grand Canyon Disconformity between Hermit fm and Coconino Sandstone
The horizontal Paleozoic layers at Grand Canyon reveal numerous disconformities Contrasting cliffs and slopes, and color changes often indicate the disconformities (but not always) Horizontal Paleozoic rocks at Grand Canyon are missing rocks from Ordovician and Silurian. Devonian rocks barely there. The horizontal Paleozoic layers at Grand Canyon reveal numerous disconformities The horizontal Paleozoic layers at Grand Canyon reveal numerous disconformities Disconformity between Hermit Formation and Coconino Sandstone in the Grand Canyon
           
           
           
           
           
           

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