INDEX. 



897 



Ohio, in the Carboniferous, 354 



Lower Helderberg in, 237. 



Millstone grit in, 321. 



mineral oil in, 26S. 



Niagara in, 221. 



Oriskany in, 242. 



Portage and Chemung in. 

 277. 



Quaternary in, 528, 529, 539. 



Salina in, 233. 



section of rocks of, 376. 



Subcarboniferous in, 293, 

 295, 305. 



terraces in, 551. 



Upper Helderberg in, 256. 



uplift in, 217. 

 Ohio River, discharge of, 637. 



iu the Champlain, 553. 



in the Carboniferous, 355. 



in the Cretaceous, 479.* 

 Oil, mineral, 197, 222, 256, 268. 

 Oldhamia antiqua, 180.* 



radiata, 180.* 

 Old Placer mines, 493. 

 Old Red Sandstone, 282. 

 Olea, 497. 

 Olenus, 188, 192. 



micrurus, 180.* 

 Olenellus, 178. 



asaphoides, 178. 



Thompsoni, 178. 



Vermontana, 178. 

 Oligocarpia, 348. 

 Oligocene, 490,§ 513. 

 Oligochseta, 123. § 

 Oligoclase, 54. § 

 Oligoporus Danae, 299* 303. 



nobilis, 298,* 303. 

 Oliva, 475, 483. 



litterata, 510. 

 Olivanites. 261. 

 Olivella,508. 



Alabamensis, 509. 

 Olivine. See Chrysolite. 

 Omphyma turbinatum, 245, 



246,* 247. 

 Onchus, 282. 



Dewevi, 229. 



tenuistriatus, 246* 247. 

 Oncoceras, 228. 

 Oneida conglomerate, 164, 218, 



220. 

 Onondaga limestone, 255. 



salt group, 232. 

 Onychodus, 263,$* 279. 

 Oolyte, 69,§ 86^§ 434,§ 435, 

 620. 



climate of, 452. 



limestones, 256. 



Lower and Upper, 435. 

 Oolytic epoch, 434. 



rocks, 63,§ 620. 

 Opal, 53. § 



Open-sea formations, 304. 

 Ophiderpeton Brownriggii, 351. 

 Ophidians, 338. § 

 Ophileta compacta, 178, 189. 



complanata, 189. 



levata, 188,* 189. 



Owenana, 203 



uniangulata, 192. 

 Ophioglossum, 271. 

 Ophiolyte, 70, 75.§ 

 Ophite, 7S.§ 

 Ophiuroids. 128, § 303. 

 Opossum, 518, 519,568. 

 Oracanthus Milleri, 308. 

 Orange Sand beds, 548, 549, 558. 



group, 493, 494. 



57 



Orbicula, 173. 



filosa, 203.* 

 Orbis rotella, 509. 

 Orbitoides, 131,§ 500. 



limestone, 494. 



Mantelli, 499,* 509. 

 Orbitolina, 460,§ 474. 



Texana, 456, 460,* 466. 

 Orbitolites, 132,§ 437. 



first of, 437. 

 Orbulina universa, 131.* 

 Orchestia, 120.*§ 

 Order of strata, 92. § 

 Oregon, Cretaceous in, 455. 



Quaternary in, 528. 



terraces in, 549 



Tertiary in, 490, 495. 

 Oreocyon latidens, 510. 

 Oreodon, 495, 506, 511. 



Culbertsoni, 511. 



gracilis, 507,* 511. 



occidentalis, 511. 



superbus, 511. 

 Organic acids, action of, 706. 



constituents of rocks, 47, § 

 59, 60, 61, 135, 604, 608, 

 612, 613, 616. 



nature, essential elements of, 

 48.§ 



remains, 47. § 

 Orient, 13. 



Origination of species, 600, 603. 

 Origin of matter, life, spirit, 

 and of the spiritual ele- 

 ment in the earth's ar- 

 rangements, not explained 

 by reference to heat, water, 

 or attraction, 831. 

 Oriskany period, 164, 241. 



sandstone, 164. 

 Ormoceras, 203, 253. 



crebriseptum, 209. 



tenuifilum, 201,* 203, 215. 

 Ormoxylon Erianum, 279. 

 Ornithotarsus, 464. 

 Orodus, 304, 351. 



mamillaris, 301* 304. 

 Orohippus, 504. § 



agilis, 510. 

 Orthacanthus arcuatus, 343. 

 Orthis, 172,*§ 175, 187, 190, 199, 



228, 249, 252, 283, 371. 

 biforata, 207. 

 Billingsii, 174* 176. 

 biloba, 226,* 229, 248. 

 calligramma, 207, 208. 

 carbonaria, 341. 

 costalis, 191* 

 electra, 192. 



elegantula, 206, 207,* 208, 



229, 230, 247, 248, 249. 

 family, 170,§* 174. 

 flabellum, 207,* 248. 

 grandaeva, 188,* 189. 

 hybrida, 248. 

 imperator, 191. 



last of, 371, 373. 

 lata, 247. 

 lvnx,200,*203,205, 206, 207, 



228. 

 Michelini.var. Burlingtonen- 



sis, 300,* 303. 

 Michelini, 308. 

 musculosa, 243. 

 occidentalis, 200* 203, 205, 



232. 

 parva, 189. 

 pepina, 178. 

 porcata, 207. 



Orthis, range of, in time, 386.* 



resupinata, 308. 



Salteri, 206. 



striatula, 172,* 207. 



testudinaria, 200,* 203, 205, 

 207, 232. 



tricenaria, 200,* 203. 



umbraculum, 803-, 307,* 308. 



Vanuxemi, 261. 



varica, 239,* 240. 



vespertilio, 207. 



virgata, 208. 

 Orthisina, 172,§ 178, 199. 



festinata, 178. 



grandaeva, 188,* 189. 

 Orthoeeras, 187,§ 200,§ 205- 

 228, 229, 243, 253, 274, 289, 

 300. 303, 332, 371, 409, 428, 

 4- 9, 483. 



acicula, 279* 



analysis of, 74. 



aculeatum, 342. 



annulatum, 247, 248. 



Blakei, 416. 



bullatum, 247, 250. 



diffidens, 191. 



first of, 178. 



ibex, 250. 



implication, 248. 



junceum, 201*203. 



Lamarcki, 189. 



laqueatum, 188,* 189. 



moniliforme, 185, 2 9, 342. 



nobile, 303. 



Ozarkense, 189. 



primigenium, 188 * 189. 



range of, in time, 387.* 



recti-annu latum, 191. 



Rushense, 342. 



tenuiseptum, 191. 



undulatum, 248. 



vagans, 208. 



velox, 191. 



vertebrale, 201,* 203. 



virgatum, 248. 

 Orthoceratite limestone, 163, 



208. 

 Orthoclase, 54. §* 

 Orthoclase-felsyte, 77. § 

 Orthonema, first of, 261. 

 Orthonota curta, 229. 



nasuta, 208. 



parallela, 205* 



undulata, 273 * 274. 

 Orthophyre, 71. § 

 Orthopters, 335, 342, 351, 450. 



range of, in time, 388.* 

 Osborne group, 513. 

 Oscillations of level, causes of, 

 784, 812. 



of water-level, causes of, 841. 



through the Cenozoic, 586. 



through the Mesozoic, 482. 



through the Paleozoic, 391, 

 392. 

 Oscillatoria, 611. 

 Osmeroides Lewesiensis, 473,* 

 475, 476. 



Mantelli, 475. 

 Osmerus, 475.§ 

 Osmunda spicant, ash of, 365. 

 Osseous fishes, 265.§* 



first of, 403. 

 Ossipyte, 70,§ 72. 

 Osteolepis, 282. 

 Ostracoids, 122,§ 188, 372, 475. 



range of, in time. 387.* 

 Ostrea, 385, 460, 495, 508. 



acuminata, 449. 



