Wikimedi'Òc

Grand Canyon geologic column.jpg - Chemako0606

Stratigraphy of the Grand Canyon.png - Jo Weber

Redwall, Temple Butte and Muav formations in Grand Canyon.jpg - Mav

Grand Canyon. North Rim. Grand Canyon Lodge 06.JPG - MiguelHermoso

CollapseBrecciaPipeUranium.png - GifTagger

Geologic Symbols and Color coding - Flickr - brewbooks (1).jpg - Josve05a

Grand Canyon Stratigraphic Units.tif - Xrksvi