822 



INDEX. 



Schweitzer, on ash of plants, 61. 

 Sciuravus parvidens, 510. 

 Scolithus, 174,§ 176. 



linearis, 177,* 178, 220. 

 Sconsia Hodgii, 511. 

 Scoria, 707. § 

 Scoriaceous rocks, 64. § 

 Scorpion, 121,§ 335, 349, 351. 

 Scotland, Archaean in, 151. 



Carboniferous in, 345, 346. 



Devonian in, 282. 



disturbances in, 525. 



glaciers in, 536. 



in the Quaternary, 541, 555, 

 572. 



Permian in, 369. 



Quaternary in, 533, 536. 



Silurian in, 244. 



Subcarboniferous in, 308. 

 Scratches, 90,§ 762. 



Drift, 530, 535. 



glacial, 684. 

 Scratching, by slides of rock, 

 90,655. 



by drifting sand, 632. 



by icebergs, 686. 

 Scrope, on liquidity of lavas, 



708. 

 Scudder, S. II., on Devonian 



insects, 274. 

 Scutella, 509. 



Gibbsii, 510. 

 Scyllarus, 475. 

 Scymnus, 510. 

 Scyphia, 474. 



reticulata, 436,* 449. 

 Sea -anemone, 117,* 127. § 

 Sea-beaches of Champlain 



epoch, 549. 

 Sea-border formation, 549, 667. 

 Sea-cucumbers, 127. § 

 Sea-lilies, 297. 

 Sea-saurians, 341. § 

 Sea-slugs, 127. § 

 Sea-urchins, 127.§ 

 Sea-water, specific gravity of, 



657. 

 Sea-weeds. See Alg.e. 

 Seal, 121,507, 592. 

 Seam, 81. § 

 Secondary, 489. § 

 Secretary-bird, 516. 

 Section, general, of geological 

 series, 142.* 



at Genesee Falls, 79 * 219.* 



at Niagara River, 219.* 



of Appalachians, ideal, 399.* 



of Archaean, 153. 



of Chemung beds, 277.* 



of Cincinnati group, at Bar- 

 rington, 196. 



of Coal-measures at Trevorton 

 Gap, Pa., 396.* 



of Coal-measures near Nes- 

 quehoning, Pa., 396.* 



of Coal-measures, with trees, 

 312.* 



of coral island, 619.* 



of Green Mts., 213.* 



of Hawaii, 704 * 



of Illinois rocks, 378. 



of Iowa rocks, 377- 



of Kilauea, 706.* 



of Michigan rocks, 376. 



of Missouri rocks, 378. 



in Massachusetts, 213.* 



of New York, 166.* 



of New York, south from L. 

 Ontario, 233.* 



Section of Ohio rocks, 376. 



of Paleozoic at Bore Springs, 

 Va.,396.* 



of Paleozoic rocks in the 

 Mississippi basin. 374.* 



of Paleozoic at Pottsville, Pa., 

 396.* 



of Pennsylvania rocks, 375. 



of Tennessee rocks, 379. 



of volcanic cones, 706.* 

 Sections of Coal-measures, 311, 

 320, 396.* 



of unconformable Carbo- 

 niferous, 308.* 



of Hamilton beds, 267,* 277.* 



of terraced valleys, 558,* 

 559.* 

 Secular changes of climate, 763. 

 Sediment of rivers, 647. § 

 Sedimentary rocks, 62, § 64. 

 Sedgwick, Devonian in England, 

 282. 



May Hill sandstone, 244. 



Permian unconformability . 

 402. 

 Sedum Rhodiola, 532. 

 Seeds, transportation of, 607. 

 Segregated veins, 733. 

 Selachians, 261,§ 301, 336, 343, 

 349,351,427, 441,450,484, 



range of, in time, 388,* 589.* 

 Selvage, 114. § 



Semi-bituminous coal, 315, § 

 346. 



analyses of, 316. 

 Semi-oviparans, 416. 

 Semnopithecus, 520. § 

 Senonian group, 470. 

 Sepia, 441. 

 Septaria, 84. § 

 Septerpeton Dobbsii, 351. 

 Sequanian group, 435. 

 Sequoia, 459, 497, 526, 582. 



formosa, 459. 



gigantea, 526. 



Langsdorfii, 498, 514. 



Reichenbachi, 459. 

 Serai series, 375. 

 Serapis, change of level in the 



temple of Jupiter, 584.* 

 Sericite slate, 69. § 

 Serolis, 120,* 



Serpentine, 55. § 73,§ 233, 728. 

 Serpent-stars, 128. § 

 Serpula, 122.§ 123.§ 

 Serpulites, 168. 



dissolutus, 204. 



Murchisoni, 178. 

 Serripes Green landicus, 551. 

 Sertularia, 130. § 



abietina. 130.* 



rosacea, 130.* 

 Severn Straits, 555. 

 Shale, 65, § 649. 

 Shaly rocks, 63. § 



structure, 82. § 

 Shaler, N. S., on rock-expan- 

 sion, 701. 

 Shark bones, analysis of, 60. 

 Sharks, 261, § 462, 473, 484, 502, 

 516. 



range of, in time, 589.* 

 Sharks' teeth, abundance of, in 



Tertiary, 502. 

 Sharpies, S. P., analyses by, 60. 

 Shasta group, 457. 

 Shawangunk grit, 222. 

 Sheep, 568. 

 Sheep-backs, 531,§ 684.* 



| Shell-beds, 492, 608. 

 Shell-heaps, 561, 562, 577, 608. 

 Shell-limestone, 75,§ 424, 492. 

 Shell-marl, 75, § 617. 

 Shepard, 0. U., on phosphatic 



deposits, 496. 

 Sheppey , fossil fruits of, 514. 

 Shotover sand, 435. 

 Showers, dust, 632. 

 Shrimp, 121, § 592. 

 Shrinkage-cracks, 84, §* 168. 

 Shumard, B. 1'., Texas Creta- 

 ceous, 456. 

 Texas Primordial, 168. 

 Shumardia, 190. 

 Sicily, elevation of, 525. 

 erosion of Simeto in, 643. 

 Pliocene of, 512, 513. 

 Siderite, 53, § 318, 688. 

 Sieboldia, 337. § 

 Sierra, 15. § 



Sierra Nevada, 24, 751. 

 glaciers in, 536. 

 in the Mesozoic, 486. 

 in the Triassic, 423. 

 Jurassic in, 431,432. 

 Quaternary in, 532. 

 terraces in, 549. 

 Sigillaria, 280, 296, 331, 339, 

 348, 349, 357. 

 alveolaris, 331. 

 Brochanti, 331. 

 Hallii, 269* 271- 

 obovata, 324,* 330. 

 oculata, 324,* 330. 

 palpebra. 271. 

 Serlii, 331. 

 simplicitas, 278. 

 stellata, 331. 

 tesselata, 331. 

 Vanuxemi, 278.* 

 Sigillaria?. or Sigillarids, 269,5 

 325, 328, 351, 353, 356, 362, 

 407. 

 Sigillarioides, 348. 

 Sigillariostrobus, 330. 

 Silica, 364. 

 as a solidifier, 50. 

 soluble, 53,§ 478. § 

 Siliceous group, 294, 379. 

 deposits, 693, 721. 

 materials of rocks from living 



species, 59, 60. 

 rocks, 63. § 

 slate, 73 § 

 solutions, 691. 

 Silicon, 49. § 

 Sillery sandstone, 184. 

 Silliman, B., on obsidian, 78. 

 Silt, 66,§ 648. 



of rivers, amount of, 648. § 

 Silurian age, 139,§ 162. 

 highest animal types in, 252. 

 number of species in, 249. 

 species of Lower and Upper 



mingled, 249, 253. 

 subdivisions of, 162, 163. 

 thickness of, 373. 

 Silurian, Lower, 166. 



thickness of, 381. 

 Silurian, Upper, 218. 

 absent from Upper Missouri, 



232. 

 Arctic American species of, 



occurring elsewhere, 249. 

 climate of, 253. 

 general observations on, 249. 

 number of species in, 253. 

 thickness of, 381. 



