INDEX 



699 



Coast line, mature, 232. 



old age of, 232. 



proofs of depression, 228-230. 



proofs of elevation, 228-230. 



rough, 226. 



smooth, 224. 



submerged, 226. 



youthful, 231. 

 Coasts in non-glaciated regions, indented, 



228. 

 Cobbleskill stage, 439. 

 Coccosteus, 464. 

 Cockerell, T. D. A., 634. 

 Coelenterata, Cambrian, 415-416. 



Carboniferous, 480. 



Devonian, 456-457. 



Ordovician, 427-430. 



Silurian, 444-445. 

 Colima, volcano, 312, 314. 

 Colorado Plateau, faults in, 262, 263. 



ground water of, 57. 

 Colorado stage, 517. 

 Columnar structure, 333-334. 

 Columnaria halli, 429. 

 Comanchean, see Cretaceous, Lower. 

 Competent strata, 257. 

 Compsognathus, 540. 

 Concentration of ores, 373. 

 Concretions, 75-77. 

 Condylarthra, 598, 622. 

 Conformity, 270. 

 Conglomerates, basal, 240. 



lens shape of deposits, 239. 

 Conifers, Carboniferous, 497, 498. 



Mesozoic, 567. 

 Conocardium ohicense, 459. 

 Consequent stream, 101-102. 

 Constant springs, 64. 

 Constellaria florida, 432. 

 Contact metamorphism, 341-343. 

 Continental glaciers, 168-171. 

 Continental shelf, 195, 197. 

 Continents, permanence of, 368. 

 Contraction, due to cooling, 364. 

 Copper minerals, 688. 

 Copper of Keweenawan system, 396. 

 Coquina limestone, 248. 

 Coral islands, 243. 



formation and growth of, 243-244. 



glacial-control theory of, 246-247. 



submarine bank theory of, 246. 



subsidence theory of Darwin of, 245, 

 247. 



Coral reefs, Devonian, 456. 

 Corals, Cambrian, 415-416. 



Devonian, 456-457. 



Mesozoic, 524. 



Ordovician, 430. 



Silurian, 444-445. 



Tertiary, 626. 

 Cordaites, 496. 



Cordilleran ice sheet, 646-647. 

 Corrasion, 83. 



Corrasion and weathering, 85. 

 Correlation of strata, 382. 

 Corrosion, 83. 

 Corynotrypa inflata, 432. 

 Cosmic geology, definition of, 21. 

 Cotopaxi, volcano, 298, 322. 

 Cotylosaurs, 489. 

 Coves and headlands, 208. 

 Crater Lake, 309, 310, 314. 

 Craterlets, 291. 

 Craters, 294, 314. 

 Creep, hillside, 41. 

 Creep of soils, 31. 

 Creodonta, Mesozoic, 594-595. 



Tertiary, 622. 

 Cretaceous, Lower, of Atlantic and Gulf 

 coasts, 514-515. 



of other continents, 515. 



of Pacific coast, 515. 



of western interior, 515. 



physical geography of, 514-516. 

 Cretaceous periods, 508. 



climate of, 570. 



peneplain of, 518-519. 

 Cretaceous, Upper, of Atlantic and Gulf 

 coasts, 516. 



of other continents, 518. 



of Pacific coast, 517. 



of western interior, 517-518. 



of physical geography of, 516-520. 



subsidence during, 516. 

 Crevasses in glaciers, 147, 151. 

 Crinoids, Carboniferous, 480, 481. 



Devonian, 457. 



Mesozoic, 524-526. 



Ordovician, 430-431. 



Silurian, 445-446. 



Tertiary, 626. 

 Crioceras, 528, 530. 

 Crocodiles, Mesozoic, 552. 



Tertiary, 624. 

 Croll's hypothesis, 660-661. 

 Cross-bedding, 234, 235, 238. 



