rock formation in the foreground and the grand canyon in the background.

rock geology formation terrain badlands cliff wadi canyon mountain valley plateau wilderness landscape ridge adventure foreground grand native americans caves president theodore roosevelt preservation scenery earth#39aph39#s geological history colorado river tributaries layer uplifted geologists cliffs national park pueblo pilgrimages tourist tourism vacation proterozoic paleozoic strata physiographic gorge visually overwhelming intricate colorful geologically ancient rocks preserved exposed walls layers geologic american continent uplift sediments elevation kaibab runoff rain snow tributary washes canyons steeper semi-arid • glen • gulch • coulee ravine gully