Sixth annual report of the United States geological survey of the Territories, embracing portions of Montana, Idaho, Wyoming, and Utah : being a report of progress of the explorations for the year 1872 (1873)
Geological and Geographical Survey of the Territories (U.S.), Hayden, F. V. (Ferdinand Vandeveer), 1829-1887 · Washington : G.P.O. · leaf 67
e entire valley has beencarved out of the massive rocks which must have been far more extensivethan we see them at present. From the source of this branch to the en-trance into the main valley, a distance of fifteen miles, a mass of rock-ma-terials has been worn out one-fourth of amilein width,… … GEOLOGICAL SUEVEY OF THE TERRITOEIES. 47 iferons limestones underlie the greater portion of the country east ofthe Grand Canon and the lake, extending over to the sources of ClarksFork, Stinkingwater, and other streams. This enormous thickness ofconglomerate once extended all over it in one…
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