696 



INDEX 



(boltoni), 



Archaeozoic era — (Continued) 



characteristics of rocks of, 390. 



conditions during, 391-392. 



contrasted with Proterozoic, 393. 



distribution of rocks of, 389. 



duration of, 392. 



foreign, 389. 



limestone of, 391. 



metamorphism of, 391. 



thickness of rocks of, 391. 

 Archelon, 557. 

 Archemedes wortheni, 481. 

 Arcoptera aviculaeformis, 629. 

 Arctinurus (Lichas) bigsbyi 



448. 

 Arikaree, Miocene, Nebraska, j6. 

 Arnold, R., jy, 581. 

 Arrhenius, 274. 

 Artesian wells, 59-60. 

 Arthrolycosa antiqua, 484. 

 Arthropods, Carboniferous, 481-484. 



Silurian, 448-450. 

 Artiodactyls, 615-619. 



divergence from perissidactyls, 599- 

 600. 

 Arve River, confluence with Rhone, 162. 

 Asama volcano, Japan, 298. 

 Asimina, 664. 



Asphalt, deposits in, 666, 667. 

 Aspidorhynchus, 534. 

 Astraeospongia meniscus, 445. 

 Astronomic geology, definition of, 21. 

 Athyris lamellosa, 482. 

 Atikokania, 397. 



Atlantic City, marine erosion and deposi- 

 tion at, 224. 

 Atlantic coast of North America, stability 



of, 230. 

 Atmosphere, work of the weather, 27- 



43- 

 work of the wind, 44-53. 

 Atolls, 243-245. 

 Atrypa reticularis, 458. 

 Aucella pioche, 527. 

 Augite, 691. 

 Auriferous gravels, 582. 

 Aviculopecten occidentalis, 483. 



Bacteria and disintegration of rocks, 37. 



Baculites, 529, 530. 



Bad lands, 588. 



Balanced bowlders, 155, 156. 



Bandai-san, 307. 



Barnacles, 460. 



Barrell, J., 216, 264, 454, 455, 469, 479. 



Barrier beaches, 221-223. 



Barrier reefs, 243. 



Bars and spits, 220. 



Basal conglomerate, 240. 



Basal unconformity, 405. 



Basalts, 331. 



Base level of erosion, 86. 



Basic rocks, 329. 



Basins, hydrographical or drainage, 103. 



Batholiths, 327, 328. 



Archaeozoic, 390. 

 Bathyurus longispinus, 435. 

 Batocrinus (Dizygocrinus) rotundus, 481. 

 Bayhead beaches, 219. 

 Bay of Naples, sand of, 236. 

 Beach deposits, 235-237. 

 Beaches, 218, 220. 



raised, 214. 

 Bedding faults, 265. 

 Bedding planes, 24, 234. 



effect of weathering on, 28, 29. 

 Beekmantown stage, 422. 

 Beheaded stream, 107. 

 Belemnites, 531, 554. 

 Bellerophon percarinatus, 482. 



sublaevis, 482. 

 Bell Sound, glacier on, 153. 

 Beltina danai, 397, 408. 

 Belts of weathering and cementation, 61. 

 Bennettitales, 565, 566, 567. 

 Bergschrund, 145. 

 Bermuda Islands, waves of, 229. 

 Bern, glaciers of, 150. 

 Billingsella coloradcensis, 414. 

 Biotite mica, 690. 

 Birds, Mesozoic, 560-563. 



Pleistocene, 673. 



Tertiary, 623-624. 

 Birmingham, Alabama, 443. 

 Bison, 673. 

 Bittern, 136. 

 Bituminous coal, 501. 

 Black Hills, 355-356. 



artesian water from, 59. 



Proterozoic of, 395-396. 

 Black River stage, 422. 

 Blastoids, Carboniferous, 480, 481. 



Devonian, 457. 



Ordovician, 431. 



Silurian, 446. 



