676 



INDEX. 



Domitic rocks, 457 

 Dopolic rocks, 456 

 Dopotassic rocks, 458 

 Dopyric rocks, 457 

 Doquaric rocks, 456 

 Dosallc rocks, 454 

 Dosodic rocks, 458 

 Dotilic rocks, 457 

 Drainage, 



effect of change of level on, 

 161 



mature, 86 



of glaciers, 273 



old age, 89 



youthful, 86 

 Dreikanter, 40 

 Drift, 287, 469 



composition of, 304 



deposition of, 298-305 



wear of, in transit, 298 

 Drygalski, E. von, 322 

 Dump moraine, 301 

 Dune areas, topography of, 32 

 Dunes, 24-37 



distribution of, 35 



effect of vegetation on, 29 



formation of, 26 



migration of, a 



shapes of, 26 



slopes of, 29 

 Dust, 



volcanic, 22, 23 



wind-blown, 22 

 Dust-wells, 269, 280 

 Dutton, C. E., 132, 534, 574, 636 

 Dynamic geology, i 



Earth, the, 



as a planet, 2 



constitution, 5 



crust, 13 



deformation of, 526 



dependence on sun 4 



distance from sun, 3 



inclination of axis, 3 



interior of, 14, 559 



internal heat, 559-74 



motions, 3 



orbit, 3 



tremors of surface, 526 



warpings of crust, 526-89 

 Earthquakes, 527-537 



causes of, 527 



destruction of life by, 536 



distribution of, 533 



destructive effects of, 530 



epicentra of, 531 



foci of, 527 



gaseous emanations during, 

 533 



geologic effects of 534-537 

 Earthquake vibrations, 526 



amplitude of 529 



Charleston, 534 



Lisbon 535 



sequences of, 533 

 Earth's crust, 



composition of, 14, 396 



warpings of, 538-551 

 Eastman. C. R., 658 



Echinodermata, 



geologic contributions of, 661 

 Echinoids, geologic contribu- 

 tions of, 661 

 Economic geology, i 

 Efflorescence, 42 

 Elaeolite, 462 

 Electricity, 



atmospheric, 43 



chemical effects of, 43 



geological effects of, 43, 52 

 Ells, R., 443 

 Emmons, S. F., 474 

 Emmons, W. H., 474. 573, 585 

 Englacial drift, 282 

 Enlargement of crystals, by sec- 

 ondary growth, 435 

 Enstatite, 400, 462 

 Eolian rocks, 469 

 Epeirogenic movements, 537 

 Epicontinental seas, 11, 326 

 Epidote, 431, 462 

 Equisetse, geologic contribu- 

 tion of, 657 

 Eras, 17-19 

 Erosion, 



affected by rotation, 194 



analysis of, no 



base-level of, 60 



by glaciers, 281-286 



by rain, 57 



by rivers, 56-177 



by undertow, 342, 346 



by waves 342-349 



by wind, 38 



conditions affecting rate of, 

 by glaciers, 283 



conditions affecting rate of, by 

 running water, 123 



cycle of, 80, 82, 164 



in arid regions, 131 



influenced by climate, 127, 

 128, 129 



influenced by composition of 

 rock, 124 



influenced by declivity, 123 



influencedbystructure,i24,i26 



influenced by vegetation, 129, 

 644 



sheet, 59 



subae'rial, 58 

 Erosion and cleavage planes, 125 

 Erosion and joints, 125 

 Erosion by streams (see Erosion 



by running water) 

 Eruptions, 591 



fissure 593 



volcanic, 594 

 Eskers, 306 

 Etna, 605, 610 



discharge of stream from, 636 

 Evaporation, 50 

 Everett, 578 

 Evolution restrictive and ex- 



pansional. 672 

 Exfoliation, 44 

 Expansional evolution, 672 

 Expansion and contraction, 



due to temperature, 44 



due to wetting and drying, 52 



Extinct lakes, 38S 



Extrusive processes, 590-637 



Falb, R., 537 

 False bedding, 487 

 Faulting and vulcanism, 627 

 Faults, 



conditions of, 521 



dip, 522 



displacement, 514 



distributive, 519 



effect on outcrops, 522 



hade, 514 



heave of, 514 



normal, 517 



oblique, 525 



relation to folds, 515 



reversed, 517, 521 



stratigraphic throw, 518 



significance of, 521 



strike, 522 



thrust, 517, 518 

 Fault scarp, 514 

 Faunas, 



abysmal, 670 



Australian, 668 



cosmopolitan, 668 



deep-sea, 670 



pelagic, 670 



photobathic, 670 

 Faunas and floras, 



basis of, 663 



effect of geographic conditions 

 on evolution of, 668 

 Feldspar, 462 

 Feldspar-leucophyres, 453 

 Feldspar-rnelaphyres, 453 

 Feldspathic minerals, 400 

 Feldspathoids, 400 

 Felsites, 452, 469 

 Fenneman, N. M., 339 

 Ferguson, A. M., 203 

 Ferns, geologic contribution of, 



657 

 Fiords, 290 

 Fisher, O., 561, 565, 574, 



581 

 Fissure eruptions, 593 

 Fletcher, G. (and Deeley, R. 



M.),322 



Flints, 426, 469 

 Floods 109 



of the Mississippi, 188 

 Flood-plain meanders, 190 

 Flood-plains, 184-98 



development of, 165 



materials of, 196 



Mississippi, 194 



relation to terraces, 205 



topography, 196 

 Floras and faunas, 



basis of, 663 



effect of geographic conditions 

 on, 668 

 Flowering plants, geologic con- 

 tributions of, 657 

 Flowing wells, 234, 242 

 Flow structure of lavas 410 

 Fluorite. 462 

 Fluvio-glacial work, 305-7 



