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Show Pioneer Work by the U. S. Geological Survey 59 they are known 'today. This hypothesis of block-faulting was accepted almost immediately by Powell, Dutton, and even by King, who had earlier held that the Basin Ranges were old erosion residuals of intensely folded strata. Gilbert's best known work on Utah geology is his mono In graph on Lake Bonneville, the predecessor of Great Salt Lake. this monumental treatise his discussion on the topographical fea His last tures of lake shores is a model of scientific exposition. geology," Studies of Basin Range structure," was professional paper by the United States Geological paper on Utah published Survey in 1928, as a The section on the ten years after his death. Wasatch fault shows the influence 'of his friend and colleague, Davis, who edited the manuscript. Clarence Edward Dutton (1841-1912) was an American who a protege of Major Powell, army officer and a geologist, selected him for duty with his survey of 1875. During most of the next ten years Dutton was engaged in geological work in the Colorado Plateau region of Utah and Arizona. Like Powell, he displayed on a grand was deeply impressed with the evidence, scale, of the vast erosion that had stripped away thousands of feet of nearly horizontal strata from the plateau country. From his observations of the concomittant rising and denudation of the evidence for his plateau he deduced support for the geological which of gravitation tends to pro figure concept of equilibrium duce in a planetary body. In a paper read before the Philosophical in 1889, Dutton proposed the name "iso in Washington Society crust. stasy" for this condition of balance in the earth's major contribution to Utah geology, his mono Geology of the High Plateaus of Utah, and the are unparalleled Tertiary History of the Grand Canyon District, for their lucid geological exposition combined with colorful de to a scription in a most engaging literary style. Dutton possessed and a poet's form and color for artist's an remarkable degree eye unusual powers of observa ability to describe them, blended with accurate, was typical of the true meticulously tion, in which he Dutton's graphs on the scientist that he was. William Morris Davis (1850-1934) was a member of the of his active' faculty of Harvard University for the greater part career as teacher, lecturer, and systematizer of the science of geo of which he was the acknowledged founder and leader morphology of the "American School." 1934 he wrote over 400 papers and his studies of land forms. For many after his retirement from Harvard he traveled widely in the Between 1880 and books, largely devoted years to |
