i68 



INDEX 



Bermuda Island, a truncated and ve- 

 neered volcanic pile, 65, 66 



gravity on, 63 

 Bora Bora Island, submergence of, 75 

 Bore-holes 



in Bermuda, 65 



in the continental crust, 78 



in the Gulf Coast sediments, 111 



in Heron Island, 73 



in Michaelmas Cay, 73 

 Bosporus, double marine current at the, 



142 

 Bottom currents. See Density currents 

 Bottom deposits, 12 

 Bouguer anomalies of gravity 



defined, 29 



negative in the United States and 

 other continental areas, 30 



positive in areas of deep ocean, 30 

 Bouguer reduction of gravity, 28 

 Boulder Dam, 144, 166 

 Boulder Canyon, 145 

 Boulder clay on Georges Bank, 152 

 Box-head canyons and gorges, 133 

 Brazil, continental terrace off, 8 

 Breakers, migrating zone of the, 137, 



138, 153 

 British Isles, continental terrace off, 8 

 Bucher, W. H., on origin of submarine 



valleys, 134, 162 

 Bullard, E. C, investigator of the British 



continental terrace, 106, no, 166 

 Buoy-control, 7 



V^ialderas, 51 

 California 



abnormal submarine canyons off, 126, 



134, 154 



continental terrace off, 106 

 Canada, gravity in southern, 44 

 Canary Islands, sialic rocks in, 50 

 "Canyon erodes itself," 151 

 Canyons, submarine 



compared with subaerial, 112, 120 ff, 

 123, 126 



dimensions of, 113 ff, 117, 122 



distinguished from furrows, 115 



en axe with land rivers, 114, 119, 154 



gradients of, 120, 123, 127 



known number of, 115 



origin of,*ii2 ff, 124, 127, 153, 155 

 post-Glacial sedimentation of floors of, 



124 

 simultaneous development of, 127 

 world-wide development of, 112, 127 

 youthful features of the terrestrial to- 

 pography, 126, 127 



Cape Canaveral, 103 



Cape Fear, 103 



Cape Hatteras, 103 



Cape Henry, 108, 115 



Cape Lookout, 103 



Cape May, 119, 133 



Cape Romain, 106 



Cape Verde Islands, sialic rocks in, 50 



Caroline Islands, coral reefs of, 67 



Catastrophic changes of volcanic islands, 

 52 ff 



Celebes Island, deformed rocks in, 89 



Celebes Sea, deep basin of, 80 



Cenozoic Era, 88 



Ceram Island, deformed rocks in, 89 



"Challenger" Expedition, 12 



Channeling, rhythm in, 139, 140 



"Channels" in continental shelves, 113, 

 118 

 related to submarine canyons, 131, 154 



Chemical reactions in volcanic gas, a 

 cause of heat, 56 



China Sea, 8, 75 



Clay, a material of low solubility, 134 



Cliff-and-talus topography, 126 



Coastal plain of eastern United States. 



133 

 Cold-water fossils in canyon sediments. 



See Fossils 

 Colorado River Canyon compared with 



submarine canyons, 113, 126 

 Compensation for terrestrial relief, 27, 



31, 32, 81 

 Concentration of "heavy" water running 



on continental terrace, 140, 148 

 Congo River, relation to Congo canyon, 



124, 154 

 Constance, bottom current of Lake, 144, 



M7 

 Contamination of primary lava, 48 

 Continental plateaus, flooding of, 8 

 Continental rocks, 44, 59 



in oceanic islands, 23, 49 



