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VOLUMES XXI-XXX. 



519 



Geology — 



Mountains, stresses caused by, ii, 317; 



iv, 256. 

 Mt. Ktaadn, drift in, ii, 229. 

 Myriapods, Carboniferous, Scudder, i, 



182; viii, 470. 

 fossil, Scudder, iv, 161. 

 Namaqualand schists, viii, 468. 

 New England coast, nature and origin 



of sediments off, Verrill, iv, 447. 

 New Mexico, formations and fossils 



of, iv, ] 49. 

 New York Bay, submarine geology 



outside of, Lindenkohl, ix, 475. 

 Niagara River and the Glacial period, 



Wright, viii, 32. 

 Nickel in Nevada, Newberry, viii, 122. 

 Nomenclature of subdivisions, i, 326. 

 Northern Pacific R. R., Newberry, xxx, 



337. 

 Nummuhtic deposits in Florida, iv, 



294; v, 158. 

 Obolella, Ford, i, 131. 

 Obsidian. Yellowstone Park, v, 106. 

 Odontornithes, work on. Marsh, i, 255. 

 Oil, origin of mineral, White, ii, 486 ; 



Newberry, iv, 232. 



regions of Penn., Ashburner, i, 242 



(Bradford Co.) ; xxx, 160 (maps); 



Carll, i, 154; ii, 78; vii, 71. 

 Oneida conglomerate, v, 472. 

 Ore Deposits, Phillips, viii, 469. 

 Ores, deposition of, Newberry, viii, 



465. 



see Vein-formation. 

 Orthocynodon, Scott and Osbom. iv, 



223. 

 Osars, Chamberlin, vii, 389. 

 Palaeocampa, affinities of, Scudder, iv, 



161. 

 Palseocrinoidea, Wachsmuth and Sprin- 

 ger, ii, 494: vi, 365 ; Miller, vi. 



105. 

 Paleozoic of Spain, vii, 491. 



of Texas, Walcott, viii, 431. 

 Corals, Lindstrom, ix. 69. 

 Fossils, Miller, iv, 474; v, 240. 

 thickness of in Penn., i, 242. 

 Panther Creek basin, Ashburner, v, 



387; vii, 407. 

 Pantotheria, Marsh, ii, 286, 410. 

 Paradoxides Davidis in America, xxx, 



72. 

 Peace River region, Dawson, i, 391. 

 Peach Bottom slates, Frazer, ix, 70. 

 Pebidian formation, v, 478. 

 Percidas. new fossil. Cope, v, 414. 

 . Permian plants of Colorado, v, 157. 

 vertebrates of Texas, i, 407. 

 Petroleum of British America, iii, 1 54. 

 see also Oil. 



Geology— 



Phenomenes d'alteration, den Broeck, 



ii, 80. 

 Philadelphia Co., v, 473. 

 Phosphatic deposits in Alabama. Smith, 



vii, 492. 

 Phosphates of North Carolina, viii, 75. 

 Phyllopods, new Devonian. Clarke. 



iii, 476. 

 Physical Survev of Georgia, Campbell. 

 vi, 411. 



Geography, Lectures on, Haugh- 

 ton, i, 150. 

 Plants, Carboniferous, i, 329, 409 ; vi, 

 412; viii, 470; of Worcester Co., 

 Mass., Perry, ix, 157. 

 of China, vi, 123, 153. 

 Cretaceous and Tertiary, Lesque- 

 reux, ix, 260. 



Devonian, Dawson, ii, 233 ; iv, 

 338, 488. 



Japan fossil, Nathorst, v, 396. 

 of the Laramie, White, vi, 120. 

 Lignitic, Manitoba, ii, 233. 

 of Mazon Creek, viii, 314. 

 Mesozoic, Ward, vii, 292 ; Fon- 

 taine, xxx, 162. 



Silurian of Wales, ii, 153. 

 Plioplarchus, Cope, v, 414. 

 Plumulites Devonicus, Clarke, iv, 55. 

 Pcecilopod in the Utica slate, iii, 151. 

 Pot-holes in Bronx Valley, v, 158. 

 at Gurleyville, Conn., v, 471. 

 Potsdam and Acadian groups, similar- 

 ity of, Whitfield, vii, 321. 



and copper-bearing rocks, vii, 

 463. 



and St. Peter's sandstones, Irving, 

 v, 401. 



group, Virginia, ix, 470. 

 sandstone, sands of, iii, 257 ; iv, 

 47 ; v, 401. 

 Prestwichia, Devonian, Williams, xxx, 



45. 

 Primordial, in British Columbia, xxx, 

 79. 



near the Hudson River, Ford, viii, 

 35. 

 Proetus longicaudus, Williams, i, 156. 

 Pterodactyls, American, Marsh, i, 342; 



iii, 251 ; vii, 423. 

 Pteropods, Paleozoic, Walcott, xxx, 17. 

 Pterygotus, Pohlman, ii, 234; iii, 418. 

 Pyrgulifera, White, ix, 277. 

 Quaternary in Europe, i, 155; see 



Glacial. 

 Quartz deposit made at the ordinary 



temperatures, viii, 448, 466. 

 Quartzyte and Silurian in Penn. confor- 

 mable, Hall, v, 473. 



decay of, Dana, viii, 448; ix, 57, 



