39 
The Grand Canyon 
corded, no matter who has gone before, and the Patties and 
the Jedediah Smiths are forgotten. In these later years some 
who have dared the terrors of the merciless river in the Grand 
Canyon spoke of it as the ‘'Great Unknown,” forgetting the 
The Work of Corrasion. 
Parunuweap Canyon of the Virgen River, Southern Utah. 20 to 30 
feet wide and 1500 feet deep and 18 miles long. 
Photograph by J. K. Hillers, U. S. Geol. Survey. 
deed of Powell; and when Lieutenant Wheeler laboriously suc¬ 
ceeded in dragging his boats up to the mouth of Diamond 
Creek, he said: “iWzu the exploration is completed.” He for¬ 
got the deed of Powell. A recent writer mentions the north- 
