386 



INDEX 



Cladoselache, 139. 



Claiborne formation, 282. 



Clams, 13, 20. 



Claosaurus, 272. 



Clark, W. B., 23, 220, 240-241, 292. 



Clarke, J. M., 8, 116, 128, 129, 134, 

 137. 



Classification, animals and plants, 

 10-22; geologic time, 31-32. 



Clear Fork series, 180. 



Cleland, H. F., 33. 



Climacograptus, 92. 



Climate, past conditions, 9; see also 

 the different periods. 



Clinton formation, 103, 105, 106, 107, 

 108, 112. 



Clitambonites, 95. 



Coal, Pennsylvanian, 158-162; origin 

 of, 164; areas in North America: 

 Permian, 189, 190; Triassic, 212; 

 Jurassic, 227; Cretaceous, 256. 



Coal Measures, 158, 161, 177. 



Coastal Plain, Atlantic, 237-244, 251- 

 252, 256, 275, 276, 282, 284-286, 

 290-292, 317, 365-366. 



Coastal Plain, Gulf, 237-245, 256, 

 275, 276, 282, 284, 287, 290, 292, 

 293, 365-366. 



Coast Range Mountains, 220, 223, 

 243, 248, 277, 289, 290, 297, 299- 

 300, 304. 



Coast Range Revolution, 300. 



Cobalt, 46. 



Cobleskill formation, 103, 107, 110. 



Coccosteus, 139. 



Coe, 18. 



Ccelenterates, 13, 15; Cambrian, 72- 

 73; Ordovician, 91-92; Silurian, 

 114; Devonian, 133-134; Missis- 

 sippian, 155; Pennsylvanian, 173; 

 Permian, 191; Triassic, 213; Ju- 

 rassic, 228; Cretaceous, 258; Ter- 

 tiary, 313. 



Coeymans formation, 121. 



Coleman, A. P., 55. 



Colorado, 102, 128, 147, 164, 181, 

 190, 220, 242, 243, 246, 287, 288, 

 310, 316. 



Colorado formation, 237, 242; time, 

 246. 



Colorado Plateau, 301, 304. 



Columbia formation, 365. 



Columbian Plateau, 303-304. 



Comanchean, 236. 



Conemaugh series, 158, 161-162. 



Conifers, 11, 13, 172, 190, 212, 213, 

 227, 256, 257. 



Connecticut Valley, 5, 203-204, 208- 

 209, 212, 216-217, 270, 297. 



Cope, E. D., 319. 



Copper, 55, 212. 



Corals (see also Anthozoans), 13, 16, 

 73, 92-93, 113-114, 133-134, 154- 

 155, 173, 191, 228, 258. 



Cordaites, 11, 12, 172, 175, 190, 212. 



Cordillera, 195-197. 



Correlation of rock formations, 23-27. 



Correlation, inorganic criteria, 23- 

 26; paleontological criteria, 26-27. 



Corydaloides, 177. 



Couch, 233. 



Crabs, 13, 20, 231, 233, 261, 314. 



Creodonts, 325-326. 



Cretaceous peneplain, 250-251, 296. 



Cretaceous period, 32, 236-273; 

 origin of name, 236; subdivisions, 

 237; distribution of rocks, 236-240; 

 character of rocks, 240-244; thick- 

 ness, 243; igneous rocks, 243-244; 

 physical history, 244-252; foreign, 

 252-255; climate, 255; economic 

 products, 256; life of, 256-263. 



Crinoids, 13, 16-17, 114-115, 134, 

 155, 173-174, 191, 213, 229, 258. 



Crioceras, 260. 



Crocodiles, 22, 234, 273. 



CroU's hypothesis, 361-363. 



Crustaceans, 13, 20-21, 53, 75-76, 

 99, 100, 101, 117-118, 157, 191, 

 215, 231, 314. 



Cryptogams, 11, 91, 154, 170, 190. 



Cryptozoon, 71-72. 



Cushing, H. P., 72. 



Cuttle-fishes, 13, 20. 



Cycads, 11, 12, 172, 190, 226-228, 

 256, 257. 



