Grand Canyon of Arizona : being a book of words from many pens, about the Grand Canyon of the Colorado River in Arizona (1906)
[Place of publication not identified] : Passenger Dept. of the Santa Fe · leaf 83
iocene periods. The length of this time in years can only be conjectured; but, as in the case already referred to, the duration of the period of erosion must have been very long, certainly many hundreds of thousands and probably millions of years. It was long enough to remove completely all the… … bvura"Iedbudy Plate BT View in the canyon, showing the great terrace at the level of the Cambrian formation. 79
Grand Canyon (Ariz.)
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
