INDEX 



171 



Figure of the earth, 24, 45, 80 

 Figure of fluid equilibrium, 25 

 Fiji Islands, continental rocks in, 23 

 Finland 



current upheaval of, 39, 40 



deficient mass under, 41, 42 



geodetic investigations in, 39 



gravity anomalies in, 42 



ice-cap on, 34 



upwarping in the future, 40, 41 

 Flores Island, 89 

 Flow of material in isostatic adjustment, 



40 

 Folding of strata, 87 

 Foraminifera shells 



in mud of canyon floors, 124 



indicating change of ocean temper- 

 ature, 124, 128 

 Fore-deeps, 82, 88, 91 

 Forel, F. A., investigator of the silty bot- 

 tom current in Lake Geneva, 129, 



142, 166 

 Formula for speed of a density current, 



150 

 Fort Monroe, Virginia, 108 

 Fossils, in sediments of continental ter- 

 race, 128 

 Funafuti atoll, test of prolonged crustal 



stability, 68 

 Furnace-effect 



of chemical reactions, 56 



of radioactivity, 33, 45 

 Furrowing of continental slopes, 115, 



155 



analogies to, 123 



explanation of, n 1 ff, 151 



of Glacial date, 136 ff, 151 



largely arrested in post-Glacial time, 



138, 141, 154 

 not correcdy represented by existing 



maps, 122 

 probably world-wide, 124, 157 

 resulting in youthful topography, 126, 



127, 153 

 rhythm in, 139 



Cjabbro, 18 



Gabbroic shell of the earth, 17, 18 

 Ganges River, relation to Ganges can- 

 yon, 124, 154 



Gaskcll, T. F., 106, no, 166 



Geneva, Lake, bottom silty current in, 



142-43, 147 

 Geodesy an aid to the geologist, 24 

 Gcoid 



defined, 25, 27 



relation to standard spheroid, 26 

 Geophysical methods of investigation, 8, 



13. 24, 45. 50 

 Georges Bank, 115, 117, 120, 134, 152 

 Germany, glacial moraines in, 34 

 Gibraltar, double density-current at, 142 

 Glacial controls, 34, 72, 113, 139, 153, 



155, 157 

 Glacial Period, 34, 128, 131 



stages of, 36, 70, 136, 157 

 Glaciated tracts, 34, 44, 45, 156 

 Gradients (slopes) 



of Atlantic submarine canyons, 122 



of Colorado River, 122 



of continental shelf, 100 



of continental slope, 9, 101 



of Snake River, 122 



of submarine canyons, longitudinal, 

 122 ff 



of submarine canyons, lateral, 122 

 Graham Land, Antarctica, relation to 



mountain-arc, 82 

 Grand Canyon of Arizona 



cliff -and-talus topography of, 126 



compared with submarine canyons, 

 113, 126 

 "Granitic" layer of the earth's crust, 17, 



19 

 Gravels, washed, on Georges Bank, 152 

 Gravimeter, a diagnostic instrument, n, 



23, 28 

 Gravitational attraction of land masses, 



27, 80 

 Gravity 



deficient in Finland, 41 

 deficient in ocean deeps, 78 

 deficient in southern Canada, 44 

 in excess in volcanic islands, 63 ff 

 reduction of observed, 28, 31, 62, 81 

 Great Barrier Reef of Australia, 10, 73 

 Great Lakes, water -gages of the, 44 

 Griggs, D., investigator of rock strength, 



78 

 Ground-water as feeder of aquifers, 132 



