INDEX 



VOLUME I. 



Abbot, M. L. (and Humphreys 



A. A.), io6, 202 

 Abrasion, 



by ice, 281 



by streams, 119 



by waves, 342 



by wind, 38 

 Abysmal fauna, 671 

 Abysmal sea, 326 

 Accretion hypothesis, 



internal temperature on, 564, 

 567 



recombination of material on, 

 568 

 Actinolite, 447, 460 

 Adams, F. D., 474 

 Adjustment of streams, 



structural, 146, 150 



topographic, 162, 163, 197 

 Adobe, 467 

 Agassiz, 366, 604 

 Agassiz, L., 321, 322, 323, 366 

 Agate, 460 

 Agate structure, 436 

 Agglomerate, 434, 467 

 Aggradation, 



by ice, 298 



by streams, 2, 177 



by wind, 25 



in sea, 333. 355 

 Aggrading streams, 



characteristics, 179, 187 

 Airy, S'r G., 341 

 Alabaster, 460 

 Albite, 400, 460 

 Alferric rocks, 454 

 Algae, 



geologic contribution of, 653 



influence on precipitation, 225 

 Alkalicalcic rocks. 458 

 Alluvial cone, 181 -3 



growth, 181 



levees, 182 

 AUuvial deposits, 177-96 

 Alluvial fans, 181-3 

 Alluvial plains, 181, 184-96 



material of, 196 



origin of, 184, 185 



pledmort, 183 



topography of, 196 

 Alluviation, 181, 196, 467 



ill-defined, 183 

 Alpine glaciers, 251 



Alps, 



crustal shortening involved in 

 formation of, 549, 576 



structure, 504, 507 

 Amber, 646 

 Amethyst, 460 

 Amphibole. 460 

 Amphiboles, 400 

 Amygdaloid, 411, 467 

 Analcite, 460 

 Analyses, 



American river-waters, 107 



American spring- waters, 235 



rain-waters, 107 



river-waters, 106, 107, 108 



sea -water, 324 



waters of enclosed lakes, 392 

 Anamorphism, 446 

 Andalusite, 460 

 Andes, snow-line in, 246 

 Andesine, 400, 460 

 Andes'te, 467 

 Angiosperms, 657 

 Anhydrite, 460 

 Animal kingdom, 



geologic contribution of, 658- 

 63 



synopsis of, 659 

 Anorthite, 460 

 Anorthosite, 467 

 Antarctica, snow-line In, 246 

 Antecedent streams, 169, 173 

 Anthracite, 426, 460 

 Anticlinal valleys, 159 

 Anticline, 504 



plunging, 155, 157, 506 

 Anticlinoria, 504 

 Antimony, 460 

 Apatite, 460 

 Aphanite, 451, 452, 467 

 Aplite, 415 



Appalachian River, 173 

 Appalachians, 



ciustal shortening due to 

 folding, 549 



extent of piracy in, 169 



peculiarities of drainage, 169 



rejuvenation of streams in, 

 165 



stream adjustment in, 147 

 Aqueous rocks, 467 

 Aragonite, 460 

 Archea:i complex, 18 



Arch of earth's crust, strength 



of, 582 

 Archeozoic era, 19 

 Arenaceous rocks, 468 

 Arid regions, erosion in, 131 

 ArgiUite, 448, 468 

 Arkose, 422, 468, 645 

 Artesian wells, 242 

 Arthropoda, geologic contribu- 

 tion of, 662 

 Asiderites, 5 

 Asphaltum, 460 

 Asteroids, 661 

 Astronomic geology, 1,2 

 Atlantic coastal plain, 587 

 Atmosphere, 5 



affected by Ufe, 639, 640 



carbonation by, 43 



chemical work of, 41-43 



evaporation and precipitation, 

 50 



fluctuations in composition, 

 639-44 



geologic activity of , 6, 21-43 



mass and extent, 6 



mechanical work of, 21-41 



oxidation by, 42 



thermal effects of, 7 

 Atmospheric electricity, 43, 52 

 Atmospheric precipitation, 



amount of, 51 

 Augite, 400, 429, 461 

 Augitite, 468 

 Autoclastic rock, 444 

 AustraUa, fauna of, 668 



Babb, C. C, 107 

 Bad-lands, 93, 130 

 Badger Mountain, 231 

 Bain, H. F., 67, 474 

 Barbadoes earth, 66j 

 Barite, 461 

 Barrier, the, 356 

 Bars, 181, 357 

 Barus, Carl, 562, 563 

 Basalt, 417, 452, 46^ 

 Basaltic columns, 417 

 Base-level, 60, 62, 82, 168 



Cretaceous, 169 



Kittatinny, 168 



temporary, 84 

 Basement complex, 18 

 Batholiths, 500, 592 



673 



