INDEX 



565 



Nautiloidea, 382; Carboniferous, 425; 

 Cretaceous, 490 ; Devonian, 402; Eo- 

 cene, 503; Jurassic, 466; Ordovician, 

 382 ; Silurian, 393 ; Triassic, 452. 



Nautilus, 374, 433*, 434, 490. 



Nebraska substage, 496, 513+-. 



Nebular Hypothesis, 356. 



Neck, volcanic, 274, 275*. 



Neocene, 497. 



Neocomian, 484. 



Neocrinoidea, 441, 450, 464. 



Neogene, 497. 



Nepheline, i8f, 199, 201 ; basalt, 201. 



Nerinia, 466. 



Neumayr, M., 461. 



Neuroptera, 402, 424, 442, 465. 



Neuropteris, 389, 432. 



Neve, 106. 



Newark series, 443, 445f . 



New Scotland, Permian of, 431. 



New Zealand, Cretaceous of, 485 ; Eocene 

 of, 501 ; geysers in, 96 ; Miocene of, 



5*5- 



New Zealand Alps, Pleistocene glaciers, 



536. 



Niagara epoch, 355; River, 98, 100; se- 

 ries, 385 ; stage, 385, 387I*. 



Nile, delta of, 142. 



Niobrara substage, 475, 48if. 



Nodosaria, 489*. 



Nodules, 227, 229*. 



Norite, 202. 



Normal fault, 244*, 245*, 246f; cause of, 

 258. 



North America, Algonkian of, 362 ; Ar- 

 chaean, 359 ; Cambrian, 369 ; Carbonif- 

 erous, 409 ; Cretaceous, 474 ; Devo- 

 nian, 394 ; Eocene, 497 ; Jurassic, 457 ; 

 Miocene, 511 ; Oligocene, 506 ; Ordo- 

 vician, 375 ; Permian, 428 ; Plejstocene, 

 526 ; Pliocene, 518 ; Silurian, 385 ; Tri- 

 assic, 444. 



North Carolina sounds, 182. 



A T othosaurus, 454. 



Nova Zembla, Carboniferous of, 417, 421 ; 

 Jurassic of, 461. 



Novaculite, 206. 



Nullipores in coral reefs, 167. 



Nummulites , 500, 502. 



Nunataks, 108, 109*. 



OAHU, 56. 



Oaks, fossil, 486, 502, 515. 



Oblique bedding, 231, 273; system, 10. 



Obsidian, ^6f, igjf. 



Obsidian Cliff, 49*, 192, 262. 



Octahedron, 9*, 10*. 



Oilstone, 206. 



Old age, of rivers, 321, 323 ; of topogra- 

 phy, 302. 



Old Red Sandstone, 398. 



Olenellus, 372 ; Fauna, 368. 



Oleuoides, 373*. 



Olenus Fauna, 368. 



Oligocene epoch, 355, 5o6f; series, 496. 



Oligoclase, i6f, 17, 196. 



Oligoporus, 424. 



Oliva, 504*. 



Olivine, 2of, 22, 193, 201, 202, 295 ; basalt, 

 201. 



Omosaurus, 471. 



Oneida substage, 386. 



Onondaga epoch, 355 ; series, 385. 



Onychocrinus, 419*, 424. 



Onyx marble, 209. 



Oolite, 169, 209f. 



Oolitic series, 457. 



Ooze, diatom, 179, 180*; foraminiferal, 

 176, 178*; Globigerina, 176; pteropod, 

 178, 179*; radiolarian, 179; siliceous, 

 214. 



Opal, 15. 



Open folds, 237*, 239. 



Ophicalcites, 295. 



OphioglossaceiB, 418. 



Ophiuroidea, 381. 



Orbitolites, 502. 



Ordovician period, 355, 375f. 



Oreodonts, 506, 509. 



Organic, accumulations, 211 ; agencies, 

 122. 



Original minerals, 194. 



Oriskany epoch, 355 ; series, 394, 395f. 



Ornithomijnus, 492. 



Ornithops'is, 491. 



Ornithostoma, 491. 



Orogenic diastrophism, 301. 



Orthis, 382, 383*, 392*, 402, 425. 



Orthisina, 382. 



Orthoceras, 383*, 384, 392*, 393, 402, 425, 

 434. 452. 



Orthoclase, i6f, 196, 198, 199, 291, 296. 



