X LIST OF FIGURES 



PAGE 



66. Norfolk Canyon and Vicinity 120 



67. Longest Canyon in Georges Bank 121 



68. Gullied Slope in California, about 75 feet in height facing 124 



69. Gullied Slope in California, about 300 feet in height facing 124 



70. Distribution of Submarine Canyons of the World 125 



71. Cliff -and-talus Topography of the Grand Canyon 



of Arizona facing 125 



72. Sandstorm in Nubia facing 125 



73. Rhone Delta in Lake Geneva 143 



74. Map of Lake Mead 145 



75. Diagram Illustrating the Kuenen Experiment on Silty Currents 149 



76. Photograph of the Tank Used in the Kuenen Experiment facing 148 



77. Suspension-current Seen from Above: Kuenen 



Experiment facing 148 



78. Turbulence in Silty Underflow Developed in 



Kuenen Tank facing 150 



79. Side Views of Density Current in Kuenen Tank facing 150 



80. Closer View of Density Current in Kuenen Tank facing 151 



81. Georges Bank, Showing Location of Glacial Till and 



Submarine Canyons 152 



82. Submarine Canyons off California 155 



