The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . ly occupied it. Great SaltLake is estimated to have contained at one period four hun-dred times its present volume of water. The terraces mark-ing its former limits are very distinctly visible, and are ninehundred feet above its present level. Lake Mono has severaldistinct terraces, the highest of which is six or seven hun-dred feet above the present lev
The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . ly occupied it. Great SaltLake is estimated to have contained at one period four hun-dred times its present volume of water. The terraces mark-ing its former limits are very distinctly visible, and are ninehundred feet above its present level. Lake Mono has severaldistinct terraces, the highest of which is six or seven hun-dred feet above the present level. Pyramid and North Car-son Lakes, in Nevada, are but the remnants of an immensesalt lake extending from the Oregon boundary to latitude * Minnesota Geological Report for 1879, p. 48. t Report of Progress, Geological Survey of Canada, 1882-84, p. 414, C. 608 THE ICE AGE IN NORTH AMERICA. 38° 30 south, a distance of two hundred and sixty Central Pacific Raib-oad is built through the bed of thislake for one hundred and sixty five miles, from the vicinityof Golconda to that of Wadsworth. This ancient lake hasbeen carefully surveyed and described by Mr. I. C. Russell,of the United States Geological Survey,* and has been named. Fig. 155—Sketch map of the Pacific coapt, showing the ontllnesof the ancient lakea Bon-neville and Labontan. (Le Conte.) * Third Annual Report of the United States Geological Survey, pp. 19>-235, and Monograph XI, 1885. THE DATE OF THE GLACIAL PERIOD. 609 Lake Lahontan, as that of which Great Salt Lake is the rem-nant was named Lake Bonneville, after the first explorers ofthe region. These basins have now no outlet to the of Lake Lahontan never had any; but, if the relativelevels were the same at former times as now, Lake Bonne-ville at its greatest extent poured through Snake River intothe Columbia. During the year 1890 Mr. Gilbert published the first volumeof his monograph upon Lake Bonneville—the ancient enlarge-ment of Great
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