INDEX. 



583 



Arenaceous rocks, i, 468 

 Arenicolites woodi, ii, 285 

 Arenig beds, ii, 342 

 Argentina, Cambrian of, ii, 272 



Cambrian fossils of, ii, 300 



Jurassic of, iii, 78 



Mississippian of, ii, 517 



Permian of, ii, 538 



Triassic of, iii, 37 

 Argillite, i, 448, 468 

 Arid regions, erosion in, i, 131 

 Aridity, Salina epoch, ii, 388 

 Arietidae, iii, 91, 94 

 Arikaree beds, iii, 269, 564. 565 

 Aristozoae rotundata, ii, 283 

 Arizona, Comanchean in, iii, 117 



Pliocene in, iii, 310 



section of strata in, iii, 575 

 Arkansas, manganese ore of, ii, 

 377 



section of strata in, iii, 560 

 Arkona beaches, iii, 397 

 Arkose, i, 422, 468*. 645 

 Armadillos, Pleistocene, ii, 498 



Pliocene, iii, 321 

 Armorican mountains, ii, 589 

 Armuchee chert, iii, 551 

 Arnioceras humboldti, iii, 91 



nevadanum, iii, 91 



woodhulli, iii, 91 

 Arnold, D., (and Arnold, R.,) 



cited, iii, 310, 311, 476 

 Arnold, R., cited, iii, 326, 495; 

 (and Arnold, D.), iii. 310, 

 311, 476; (and Haehl), iii, 

 263 

 Arrhenius, S., cited, i, 671, 672; 



iii, 444, 445 

 Arsinoltherium, iii, 284 

 Artefacs, iii, 502 



burial of, iii, 510 



in talus, iii, 510 

 Artesian wells, i, 242 

 Arthroacantha, ii, 470 



punctobrachiata, ii, 471 

 Arthrodirans, Devonian, ii, 461, 



469 

 Arthrolycosa antiqua, ii, 611 

 Arthropoda, Cambrian, ii, 280 



Devonian, ii, 490 



geologic contribution of, i, 662 



Permian, ii, 652 



Triassic, iii, 57 

 Artiodactyls, Eocene, iii, 236 

 Artisia, ii, 601 

 Artocarpus, iii, 173 

 Arundel formation, iii, 59 

 Aschkinass, E., cited, ii, 671; 



(and Rubens), iii, 444 

 Ashley, G. H., cited, ii, 548; iii, 

 201, 214, 263, 274, 310, 315. 

 316, 475. 481; (and Blatch- 

 ley), ii, 424. 620; iii, 556 

 Ashley River marl, iii, 244 

 Asia, Archean of, ii, 159 



Cambrian of, ii, 272 



Cretaceous of, iii, 170 



Devonian of, ii, 448 



Eocene of, iii, 219 



Glacial period of, iii, 424 



Asia, Jurassic of, iii, 77 



Lias of, iii, 77 



Lower Cretaceous of, iii, 

 129 



Miocene of, iii, 280 



Mississippian of, ii, 517 



Oligocene of, iii, 252 



Pennsylvanian of, ii, 589 



Permian of, ii, 634 



Pliocene of, iii, 320 



Proterozoic of, ii, 215 



Triassic of, iii, 37 

 Asiderites, i, 661 

 Asiminia triloba, iii, 491 

 Asphalt, i, 460 



in Texas, iii, 116 

 Astarte, iii, 295, 403 



thomasii, iii, 292 

 Asteroids, i, 661 

 Astoria beds, iii, 248 

 Astraeospongia meniscus, ii, 403, 



408 

 Astral eon, ii, 83, 90 

 Astresius liratus, iii, 136 

 Astrohelia, iii, 294 

 Astronomic geology, i, 1, 2 



hypotheses of glacial climate, 

 iii, 426, 431 

 Astrophyllites, ii, 602 



Mississippian, ii, 537 

 Astylospongia, ii, 408 



praemorsa, ii, 403 

 Atane series, iii, 132 

 Atascadero formation, iii, 68, 



577 

 Athens shale, iii, 549 

 Athyris, ii, 615 



hannibalensis, ii, 521 



lamellosa, ii, 525 



spiriferoides, ii, 521 

 Atlantic and Gulf border, Coman- 

 chean of, iii, 108 

 Atlantic coast, Cretaceous of, iii, 

 137 



Cretaceous faunas, iii, 187 



Eocene of, iii, 198 



Miocene of, iii, 258 



Pleistocene of, iii, 447 



Pliocene of, iii, 308 

 Atlantic coastal plain, i, 587 

 Atlantosaurus beds, iii, 119 



position of, iii, 66 

 Atmosphere, i, 5 



affected by life, i, 639, 640; 

 ii, "5 



carbonation by, i, 43 



changes in Permian period, ii, 

 660 



chemical work of, i, 4i~43 



evaporation and precipitation, 

 i, 5o 



fluctuations in composition, i, 

 639-644 



geologic activity of, i, 6, 21-43 



mass and extent, i, 6 



mechanical work of, i, 21-41 



nature of earliest, ii, 95 



origin of, ii, 93 



oxidation by, i, 42 



thermal effects of, i, 7 



Atmosphereless stage of earth, 



ii, 92 

 Atmospheric carbonic acid gas, 



ii, 662 

 Atmospheric difficulties of nebu- 

 lar hypothesis, ii, 86 

 Atmospheric electricity, i, 43, 52 

 Atmospheric gases, gathering of, 

 ", 97 



gravity and, ii, 96 



molecular velocities of, ii, 97 

 Atmospheric hypotheses of gla- 

 cial climate, iii, 432 

 Atmospheric precipitation, 



amount of, i, 51 

 Ataka formation, iii, 562 

 Atremata, ii, 356 

 Atrypa hystrix, ii, 478 



reticularis, ii, 409, 453, 478 

 Atrypina imbricata, ii, 455 

 Aturia, iii, 294 



bed?, iii, 248 

 Atwood, W. W., cited, ii, 252; iii, 



335, 336, 470, 47i 

 Aucellia, iii, 82, 91, 92, 134 



brauni, iii, 92 



crassicollis, iii, 136 



mosquensis, iii, 83 



pallosi, iii, 92 



piochii varorata, iii, 136 

 Auchenia vicugna, iii, 234 

 Augite, i, 400, 429, 461 

 Augitite, i, 468 

 Augusta series, ii, 500, 501, 561; 



iii, 558 

 Aulocopina, ii, 408 

 Austin limestone, iii, 142, 143, 



189 

 Australia, Archean of, ii, 159 



Cambrian of, ii, 272 



Cambrian fossils of, ii, 300 



Cretaceous of, iii, 171 



Devonian of, ii, 248 



Eocene of, iii, 219 



fauna of, i, 668 



Jurassic of, iii, 78 



Miocene of, iii, 280 



Mississippian of, ii, 517 



Pennsylvanian of, ii, 590 



Permian glacial beds of, ii, 

 632 



Pleistocene life of, iii, 501 



Triassic of, iii, 38 

 Autoclastic rock, i, 444; ii, 204 

 Aux Vases sandstone, ii, 561 

 Avicula, iii, 91, 92 

 Aviculopecten carboniferous, ii, 

 616 



occidentalis, ii, 616 

 Azoic eon, ii, 83 



Babb, C. C, cited, i, 107 

 Babbitt, F. E., cited, iii, 516 

 Backstrom, cited, ii, 216 

 Bacteria, Devonian, ii, 493 

 Baculites, iii, 187 

 grandis, iii, 189 

 Badito formation, iii, 206 

 Bad-lands, i, 93, 130; iii, 269 



