INDEX 



683 



stratification, 486 

 Stratified rocks, 14 

 Stratigraphic geology, i 

 Stratigraphy and fossils, 647 

 Stratigraphy and paleontology, 



647 

 Stream erosion, 56-177 



economic effects of, 108 



influenced by rock, 124 



influenced by declivity, 123 



influenced by structure, 125, 

 127 



topography developed by, 92 

 Streams, 



abrasion by, 119 



adjustment in Appalachians, 

 148 



, djustment of. 146. 147 



affected by rotation of earth, 

 194 



'"ggradational work of, 177- 

 204 



antecedent, 169, 171 



characteristics of aggrading, 

 179. 187 



compared with glaciers, 262 



consequent, 78 



corrasion by, 119 



cross-currents in, 117 



decrease in size of, 179. 180 



deposition by, 177 



drowning of, 170 



effect of change of level on, 



161, 171 

 erosion by, 57-177 

 floods of, 109 



ice of, 118 



intermittent, 71, 72 



mature, 86 



mechanical work of, 226 



migration from synclines to 



anticlines, 159 

 mineral matter in solution in, 



225 

 old age of, 89 



overloading of, 178, 179, 186 

 permanent, 70 

 piracy of, 103 

 ponding of, 171 

 relation of width to meander 



belt, 193 

 solution by. 108, 122 

 sources of, 178 

 struggle for existence among, 



100 

 superimposed. 150 

 topographic adjustment of, 



162, 163, 197 

 transportation by, 115, 116 

 velocity of. 115 



young, 85 

 Stream-terraces, 204-212 

 Stream velocity, 



effect on transportation, 115 

 Stream work. 57-212 

 Stress-accumulation, 583, 588 

 Striae, 283 

 Strike. 501 

 Strike fault. 522 

 Stromboli, 636 



Structural adjustment of valieys, 



147 

 Structural features of rocks, 486- 



525 

 arising from disturbance, 500 

 of igneous rocks, 498 

 of sedimentary rock, 486 

 Structural geology, 1, 486 

 Structural valleys, 77 

 Structure of glacier ice, 308 

 Structure of rock, influence on 



erosion, 125 

 Struggle for existence among 



valleys, ico 

 Subaerial erosion, 58 

 Subatomic forces, causes of 



crustal movement, 556 

 Subdivisions of geology, i 

 Subglacial load, 282 

 Subsidence, effect on coast-lines, 



331 

 Suess, Edw.. 538 

 Sulphur, 466 

 Sulphur springs, 235 

 Sun-cracks. 373. 490 

 Superglacial load, 282 

 Superimposed streams. 150 

 Surface moraines, 266 

 Susquehanna River. 168 

 Switze'-land, snow-fields of, 245 

 Syenites, 415, 452, 473 

 Syncline, 157, 504 

 Synclinoria, 504 

 Syssiderites, s 



Tachylite, 473 



Tait, P. G., 552, 572, 573 (and 



Thompson, J.), 560, 579 

 Talc, 466 

 Talcose rock, 431 

 Talus, 112 

 Talus cone, 182 

 Talus glacier, 233, 232 

 Tarr, R. S.. 165 

 Temperature, 



at centre of earth, 571 



atmospheric. 43. 46, 49 



based on Laplace's law, 564 



effect on erosion, 129 



effects of changes on rocks, 

 44 



expansion and contraction due 

 to changes of, 44 



in excavations, 569 



of interior of earth, 559-570 



of lavas, 615, 627 

 Tennessee River, history of, 168- 



169 

 Tension joints, 514 

 Terminal moraine, 266. 301 

 Terraces, stream, 204-212 



flood-plain. 205 



rock. 140. 204 



termini of. 210 



wave-built. 363 



wave-cut. 351, 353 

 Terrigenous deposits, ia sea, 



379 

 Thallophytes. geologic contribu- 

 tion of, 653 



Thames River, 224 



material in solution in, 108 

 Thibetan plateau, 548 

 Thompson, James, 322, 560, 579 

 I Thompson, W. G., 119 

 I " Thorofares," 358 

 Thrust-f'iult, 517, 518 

 Tides, 4. 338 



effect on rotation, 4 

 Tilden, W. A., 620 

 Tilhemic rocks, 457 

 Till, 473 

 Titanite, 467 

 Todd, J. E., 195 

 Topaz, 467 

 Topographic adjustment of 



streams, 162, 163, 197 

 Topographic effects of glacial 



erosion. 287 

 Topographic effects of ground- 

 water, 231 

 Topographic map, explanation 



of, 30 

 Topographic maturity, 86 

 Topographic old age, 89 

 Topographic youth, 86 

 Topography, 



developed by river erosion, 

 92 



dune, 32 



landslide, 231 



mature, 86 



of alluvial deposits, 196 



of glaciers, 266 



of ocean bottom, 326 



of shallow-water deposits, 374 



youthful 86 

 Top-set beds, 202 

 Trachyte, 473 

 Transportation, no 



by glaciers, 281 



by ocean currents, 367 



by streams, 115, 119 



by waves, 354 



by wind, 22, 25 

 Trap, 419, 473 

 Travertine, 473 

 Trees, uprooting of, 40 

 Tremolite, 447, 467 

 Tributaries, 



development of, 78 



position of, 79 



topographic adjustment of, 

 197 

 Tripoli, 661 

 Tripohte, 426 

 Trout creek, 193 

 Tschermak, G., 538 

 Tufa (see Tuffs) 

 Tufa cones, 611 

 Tufa deposits, 611 

 Tuffs, 404, 434, 473 

 Tuscarora deep, 548 

 Two Medicine River, 154, 157 

 Tyndall, J., and Huxley, T. H., 

 322 



Udden, J. A., 22 

 Uinta Mountains, lateral mo- 

 raines of, 303 



