814 



INDEX. 



Niagara River, recession of Falls 

 of, 219, 590. 



section along, 219* 



whirlpool in, 637. 

 Nicholson, H. A., English Grap- 



tolites, 192. 

 Niles, W. H., on tension in 



rocks, 743. 

 Nileus, 190. 



affinis, 250. 



armadillo, 250. 



macrops, 250. 



scrutatus, 250. 

 Niobrara group, 456. 

 Nipa, 514. 

 Niso, 508. 

 Nitrogen, 52, 365. 

 Noar], analysis of coal, 316. 

 Nodosaria, 474. 



vulgaris, 131.* 

 Nodules, phosphatic, 61. § 

 Nceggerathia, 271, 348, 349. 



aequalis, 349. 



distans, 349. 



minor, 280.* 

 Normandy Crag, 513. 

 North American coast, sand- 

 bars of, 669. 

 North America, Carboniferous 

 areas of, 291. 



completed, 525. 



elevations in, during the Ter- 

 tiary, 523, 524. 



geological record imperfect 

 in, 600. 



in the Carboniferous, 355. 



in the Cretaceous, map of, 

 479.* 



in the Quaternary, 527- 



map of, in the Archaean, 149.* 



map of, in the Cretaceous, 

 479.* 



map of, in the Tertiary, 521.* 



mean height of, 14. 



peat-beds of, 1 16. 



Quaternary Mammals of, 565, 

 571. 



recent change of level in, 583. 



separate regions of, 36. 



Silurian of, 162. 



surface-form of, 23.* 



the continent of Herbivores 

 571. 



through the Mesozoic, 481. 



trends in, 36. 

 North Carolina, Archaean iu, 

 150. 



coast of, 669.* 



Cretaceous in. 455. 



iron ores of, 154. 



Taconic in, 160. 



Tertiary in, 490, 495. 



Triassic in, 404, 405, 406, 419. 

 Norway, Archaean in, 151, 157. 



fiords in, 534. 



glaciers in, 675. 



in the Cretaceous, 480. 



iron-mines of, 154. 



Primordial in, 179. 



Quaternary in, 532, 556. 



Silurian in, 207, 245. 

 Norwich Crag, 513, 514, 519. 

 Noryte, 70. § 

 Notharctus, 510. 

 Nothosaurus, 428, 429, 484.§ 



mirabilis, 428. 



Schimperi, 429. 

 Notidauus primigenius, 262,* 

 501,* 509. 



Notopocorystes, 475. 

 Notornis, 580. 



Nototherium Mitchelli, 571. 

 Nova Scotia, Archaean in, 150. 



Carboniferous in, 145, 291, 

 309, 310, 319, 339, 355, 358, 

 392. 



Clinton in, 221. 



fiords in, 534. 



gold-bearing rocks of, 167. 



in the Champlain, 552. 



Lower Helderberg in, 238. 



Niagara in, 221. 



Orisfeany in, 242. 



Primordial in, 166. 



Subcarboniferous in, 295, 304. 



Triassic in, 405, 418. 



uplifts in, 289. 



zeolites of, 418. 

 Nucleocrinus, 261, 288. 



Verueuili, 259.* 264. 

 Nucleolites crucifer, 409, 477. 

 Nucleospira, 171. 



pisum, 248. 

 Nucleus of continent, 160. 



of earth, 737. 

 Nucula, 284, 385. 



Cobboldias, 519. 



limatula, 494. 



nasuta, 303. 



Shumardana, 303. 



truncata, 458. 

 Nuculana, 303. 



bellistriata, 342. 

 Nullipores, 60,§ 135,§ 607, 621. 

 Nummulites, 131.fi 437, 500, 

 512, 515. 



first of, 437. 



nummularia, 131.* 



levigatus, 518. 



radiatus, 519. 



variolarius, 519. 

 Nummulitic beds, 512, 525. 



limestone, 512. 

 Nyctitherium velox, 510. 



priscum, 510. 

 Nyssa, 498, 515. 



Oahu, chalk in, 477, 755. 



map of, 31.* 

 Oak, 459, 497, 514, 515. 

 Oberquader group, 470. 

 Obolella, 173.§ 190. 



chromatica, 177. 



ciogulata, 177. 



desquamata, 177. 



nana, 177.* 



Phillipsii, 177. 



plumbea, 192. 



polita, 177. 



range of, in time, 386.* 



transversa, 176. 

 Obolus, 173.*§ 



Apollinis, 173,* 177, 208. 



composition of shell of, 61. 



filosus, 200* 203. 



Labradoricus, 177. 



range of, in time, 386.* 

 Obsidian, 77, § 78,§ 722. 

 Occident, 13. 

 Oceans, arrangement of, 11. 



depth of, 12, 739. 



relation between the size of, 

 and the heights of the 

 borders, 25. 



trends of, 35. 

 Oceanic basins, 11, 12, 738. 



currents, 38, 658, 060, 663, 

 665, 668. 



Oceanic forces, 657- 



formations, 666, 672. 



impurities, 593. 



islands, i4. 



life not easily exterminated, 

 614. 



movements, system of, 38.* 



temperatures, 41. § 



water, specific gravity of, 657. 

 Ocoee group, 163, 379. 

 Oculina arbuscula, analysis of, 

 60. 



Mississippiensis, 509. 



Vicksburgensis, 509. 

 Odontaspis, 475. 

 Odontidium, 634.* 



pinnulatum, 496.* 

 Odontocephalus selenurus, 261. 

 Odontopteris, 331, 348. 



crenulata, 331. 



Schlotheimii,326,*330. 

 Odontopteryx, 516. 

 Odontornitb.es, 468. 

 (Eningen, fishes at, 520. 

 Ogygia, 174. § 



Buchii, 208. 



Selwynii, 192. 

 Ohio, Carboniferous in, 291, 

 314, 321. 



Cincinnati in, 197. 



Clinton in, 220. 



Hamilton in, 267. 



in the Carboniferous, 354. 



Lower Helderberg in, 237. 



Millstone grit in, 321. 



mineral oil in, 268. 



Niagara in, 221. 



Oriskany in, 242. 



Portage and Chemung in, 

 277. 



Quaternary in, 528, 529, 537. 



Salina iu, 233. 



section of rocks of, 376. 



Subcarboniferous in, 293,295, 

 305. 



terraces in, 548. 



Upper Helderberg in, 256. 



uplift in, 217. 

 Ohio River, discharge of, 636. 



in 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. 

 Oligocurpia, 348. 

 Oligocene, 490,§ 513. 

 Oligochaeta, 123. § 

 Oligoclase, 54. § 

 Oligoporus Danse, 299,* 303. 



nobilis, 298,* 303. 

 Oliva, 475, 483. 



litterata, 510. 

 Olivanites, 261. 

 Olivella, 508. 



Alabamensis, 509. 

 Olivine. See Chrysolite. 

 Omphyma turbinatum, 245, 

 246* 247. 



