Photograph of a rock outcrop displaying an unconformity between Chinle and Wingate layers, in the Moenkopi Valley, Arizona, in 1914. Photo 960 from Herbert E. Gregory Book 7: Navajo, 1913, 1914
Photograph of rock layers showing an unconformity, near Sunrise Springs, Apache County, Arizona, in ...
Photograph by K. C. Heald, of a cliff in Blue Canyon, Coconino Co., Arizona, 1913. Rock shows an un...
Photograph of rock showing unconformity between McElmo sandstone over Dakota sandstone in Steamboat ...
Photograph of a rock outcrop displaying an unconformity between Chinle and Wingate layers, in the Mo...
Photograph of a cliff in the Moenkopi Valley of Arizona in 1914, displaying an unconformity between ...
Photograph of exposed strata in Nazlini Canyon, Arizona, displaying an unconformity with Shinarump o...
Photograph shows a rock formation near Fort Defiance, Arizona, displaying an unconformity of Shinaru...
Photograph of rock displaying unconformity below the Shinarump (Late Triassic conglomerate), near Ch...
Photograph of rock outcrops near Fort Defiance, Arizona, displaying an unconformity between Permian ...
Photograph of cliffs a mile below a bridge over the Little Colorado River, displaying an unconformit...
Photograph of rock outcrops near Fort Defiance, Arizona, displaying an unconformity between Permian ...
Photograph of rock showing unconformity between McElmo sandstone over Dakota sandstone in Steamboat ...
Photograph of a mesa in Monument Valley showing Moenkopi under DeChelly sandstone and capped by Shin...
Photograph of a view east across the mouth of Reservoir Canyon, Moenkopi, Arizona, in 1914. Photo 9...
Photograph shows an unconformity in rock strata near Sunrise Springs, Arizona. From Herbert E. Grego...
Photograph of rock layers showing an unconformity, near Sunrise Springs, Apache County, Arizona, in ...
Photograph by K. C. Heald, of a cliff in Blue Canyon, Coconino Co., Arizona, 1913. Rock shows an un...
Photograph of rock showing unconformity between McElmo sandstone over Dakota sandstone in Steamboat ...
Photograph of a rock outcrop displaying an unconformity between Chinle and Wingate layers, in the Mo...
Photograph of a cliff in the Moenkopi Valley of Arizona in 1914, displaying an unconformity between ...
Photograph of exposed strata in Nazlini Canyon, Arizona, displaying an unconformity with Shinarump o...
Photograph shows a rock formation near Fort Defiance, Arizona, displaying an unconformity of Shinaru...
Photograph of rock displaying unconformity below the Shinarump (Late Triassic conglomerate), near Ch...
Photograph of rock outcrops near Fort Defiance, Arizona, displaying an unconformity between Permian ...
Photograph of cliffs a mile below a bridge over the Little Colorado River, displaying an unconformit...
Photograph of rock outcrops near Fort Defiance, Arizona, displaying an unconformity between Permian ...
Photograph of rock showing unconformity between McElmo sandstone over Dakota sandstone in Steamboat ...
Photograph of a mesa in Monument Valley showing Moenkopi under DeChelly sandstone and capped by Shin...
Photograph of a view east across the mouth of Reservoir Canyon, Moenkopi, Arizona, in 1914. Photo 9...
Photograph shows an unconformity in rock strata near Sunrise Springs, Arizona. From Herbert E. Grego...
Photograph of rock layers showing an unconformity, near Sunrise Springs, Apache County, Arizona, in ...
Photograph by K. C. Heald, of a cliff in Blue Canyon, Coconino Co., Arizona, 1913. Rock shows an un...
Photograph of rock showing unconformity between McElmo sandstone over Dakota sandstone in Steamboat ...