Photograph of rock showing unconformity between McElmo sandstone over Dakota sandstone in Steamboat Canyon, Apache Co., Arizona, 1911. Photo 519 from Herbert E. Gregory Book 5: Navajo, 191
Photograph of rock layers showing contact between Navajo and McElmo sandstone strata in Blue Canyon ...
Photograph of rock outcrops near Fort Defiance, Arizona, displaying an unconformity between Permian ...
Photograph shows a rock formation near Fort Defiance, Arizona, displaying an unconformity of Shinaru...
Photograph of rock showing unconformity between McElmo sandstone over Dakota sandstone in Steamboat ...
Photograph of cliffs showing an unconformity between McElmo and Dakota formations near Jetty-to Spri...
Photograph of erosion features in McElmo sandstone overlaying Dakota rock, located between Ganado an...
Photograph by K. C. Heald, of a cliff in Blue Canyon, Coconino Co., Arizona, 1913. Rock shows an un...
Photograph of exposed rock 2 miles west of Manuelito, New Mexico, displaying an unconformity at the ...
Photograph of cliffs in Tse-bito [now Beshbito] Wash, displaying an unconformity between Dakota and ...
Photograph of a rock outcrop of McElmo sandstone in Blue Canyon, Navajo Co., Arizona, in 1914. Phot...
Photograph of a rock outcrop displaying an unconformity between Chinle and Wingate layers, in the Mo...
Photograph of rock displaying unconformity below the Shinarump (Late Triassic conglomerate), near Ch...
Negative for photograph of exposed rock 2 miles west of Manuelito, New Mexico, displaying an unconfo...
Photograph of exposed strata in Nazlini Canyon, Arizona, displaying an unconformity with Shinarump o...
Photograph of rock outcrops near Fort Defiance, Arizona, displaying an unconformity between Permian ...
Photograph of rock layers showing contact between Navajo and McElmo sandstone strata in Blue Canyon ...
Photograph of rock outcrops near Fort Defiance, Arizona, displaying an unconformity between Permian ...
Photograph shows a rock formation near Fort Defiance, Arizona, displaying an unconformity of Shinaru...
Photograph of rock showing unconformity between McElmo sandstone over Dakota sandstone in Steamboat ...
Photograph of cliffs showing an unconformity between McElmo and Dakota formations near Jetty-to Spri...
Photograph of erosion features in McElmo sandstone overlaying Dakota rock, located between Ganado an...
Photograph by K. C. Heald, of a cliff in Blue Canyon, Coconino Co., Arizona, 1913. Rock shows an un...
Photograph of exposed rock 2 miles west of Manuelito, New Mexico, displaying an unconformity at the ...
Photograph of cliffs in Tse-bito [now Beshbito] Wash, displaying an unconformity between Dakota and ...
Photograph of a rock outcrop of McElmo sandstone in Blue Canyon, Navajo Co., Arizona, in 1914. Phot...
Photograph of a rock outcrop displaying an unconformity between Chinle and Wingate layers, in the Mo...
Photograph of rock displaying unconformity below the Shinarump (Late Triassic conglomerate), near Ch...
Negative for photograph of exposed rock 2 miles west of Manuelito, New Mexico, displaying an unconfo...
Photograph of exposed strata in Nazlini Canyon, Arizona, displaying an unconformity with Shinarump o...
Photograph of rock outcrops near Fort Defiance, Arizona, displaying an unconformity between Permian ...
Photograph of rock layers showing contact between Navajo and McElmo sandstone strata in Blue Canyon ...
Photograph of rock outcrops near Fort Defiance, Arizona, displaying an unconformity between Permian ...
Photograph shows a rock formation near Fort Defiance, Arizona, displaying an unconformity of Shinaru...