INDEX 



169 



Continental shelf, "channels" of, 113 



defined, 9, 100 



outer sediments of relatively coarse, 

 153 

 Continental slopes, 10, 100 



canyons of. See Canyons, submarine 



furrows of. See Furrowing of conti- 

 nental slopes 



gradient of, 101, 127, 156 



inadequate sounding of, 122 



ridges of, 115 



ruggedness of, 99, m 



valley systems of, 5. See Canyons; 

 Furrowing 

 Continental terraces, 9 ff , 99 ff 



break of slope (fall-off) of, 100, 153 



composition of, 10, 11, 99, 106, 109, 

 127, 156 



dimensions of, 99, no 



discontinuities in, 109 



furrowed by currents of the Glacial 

 Period, 113, 136 ff 



migration of shorelines on, 137, 138, 



153 



post-Glacial sedimentation on, 124 



profile of equilibrium for, 100 



relative homogeneity of sediments in, 

 126 



slow development of, 129 



total length of, 10, in 

 Continents 



distribution of isostasy in, 32 



mean heights of, 7, 26 



origin of, 3, 47 



rock-layers under, 18 



support of, 28, 31 

 Cook Islands, 66 

 Co-operation among specialists needed, 



49 

 Coral larvae, colonizers of reef plat- 

 forms, 68, 71 

 Coral reefs (atolls and barriers), 10, 157 



inhibition of growth of, 70 



lagoons of, 67 ff 



relation to banks, 70 



tests of crustal stability, 67 ff, 69, 74 



uplifted, 92 



veneers on beveled mountains, 67, 68 



wall-like, 69, 72, 73 

 Cordilleras, characteristics of, 31, 86 ff 



Core of the earth, iron, 46 



not solidified, 47 

 Cores of deep-sea deposits, 13, 124 

 Crary, A. P., 106, 166 

 Crust of the earth, 5, n, 17, 21, 27 



definition of, 32, 33 



distortion of, 77, 85 ff, 88 



strength of, 62 ff, 65 ff, 78, 79, 97, 130 



sub-oceanic, 19 



thickness of, 31, 32, 33, 57, 61, 97 

 Crust-substratum hypothesis, 60 

 Cuba, uplift of, 95 

 Current upwarping, of Fennoscandia, 38 



of northeastern North America, 44 

 Cusps (cuspate forelands) of the eastern 



coast of the United States, 104 



J_yaly, R. A. See bibliographical refer- 

 ences, p. 165 

 Damping of earthquake waves, 16 

 Dana, J. D. 



on coral reefs, 73 



on the Hudson Canyon, 128, 130 

 Dardanelles, double density-current at 



the, 142 

 Darwin, C. 



on coral reefs, 73 



on the rocks of Ascension Island, 23 

 Dead Sea, below sealevel, 4 

 Death Valley, below sealevel, 4 

 Deep, ocean, 7, 9, 97 



Japan, 7 



Java, 82, 91 



Mindanao, 7 



Nero, 7, 78 ff 



origin of, 77 



Porto Rico, 82 



tests of crustal strength, 78 

 Deflection of the plumb-line, 23, 26 

 Delaware River, relation to shelf "chan- 

 nel," 119 

 Deltas, asymmetry of, 101 ff 

 Density 



of continental rock, mean, 30, 61, 85 



of sea water, mean, 26 



of sub-oceanic rock, mean, 30, 61, 85 

 Density currents, 112, 129, 136, 145 ff 



acceleration of, 137, 140, 148, 151 



analogies of submarine, 137 



