INDEX 



705 



Salts of sea, 167 



Sandstone, 267, 270 



Sanu'umon interglacial stage, 635 



iinon-Peorian epoch, 633 

 Santa Cruz beds, 590 

 Sapping, 8g 



Suratogan epoch, 344, 346 

 Sassafras subintegrifolium, 547 

 Satin spar, 257 

 Saurians, Cretaceous, 546 



Jurassic, 515 



Triassic, 494 

 Savage, T. E., cited, 368 

 Scala potomacensis, 573 



sayana, 597 

 Scaphites nodosus, 554 

 Schist, 295, 297 

 Schistosity, 10, 294, 295 

 Schizocrania filosa, 382 

 Schizodus chesterensis, 437 

 Schizolopha textilis, 381 

 Schizoneura gondwanensis, 478 

 Si hizophoria multistriata, 414 



swallovi, 435 

 Schizotreta ovalis, 382 

 Schoharie giit, 402 

 Schuchcrt, Chas., cited, 417 

 Schwarz, E. H. L., cited, 413 

 Scoriaceous rock, 250 

 Scorpions, Silurian, 401 

 Scott, E. H., cited, 461 

 Scott, W. B., cited, 365, 567 

 Scour-and-fill, 112 

 Sea. See ocean. 

 Sea caves, 180, 181 



cliffs, 178 



Sea coast, simplification of, 182 

 Secular movements, 217 

 Sedgwickia topekaensis, 481 

 Sediment, cementation of, 267 



deposition of, 266 



how carried, 76 

 Sedimentary rocks, 265 

 Sedimentation, Cambrian, 351 



variations in, 351 

 Sediments, induration of, 285 

 Seed-bearing ferns, 423 

 Seiches, 201 

 Seismology, 206 

 Selenite, 257 

 Selma Chalk, 535 

 Seminula argentea, 469 



subquadrata, 437 

 Senecan series, 402, 406 

 Septaria, 289 



Septarian nodule, 290 



Serpentine, 258, 291 



Sevier shale, 369 



Seward, A. C., cited, 461 



Shale, 267, 270 



Shaler, N. S., cited, 39, 179 



Shallow-water deposits, 189, 190, 193 



characteristics of, 192 

 Sharks, Mississippian, 438 

 Shastan fossils, 531 

 Shastan group, 525 

 Shearing of ice, 143 

 Sheet erosion, 59 

 Shimek, B., cited, 645 

 Shore-currents, 175, 183 



deposition by, 184 



Shore-deposition and shore lines, 187 

 Shore drift, 183 

 Shore lines, 170 



and deposition, 187 



mature, 182 



warping of, 662 

 Short hills, 628 

 Shrinkage of earth, 225. 226 

 Sierra Nevada, history of, 606 



peneplanation of, 585 

 Sigillarias, 459, 461, 462, 476 

 Siliceous deposits, 268 

 Siliceous sinter, 660 

 Silurian of West, 393 

 Silurian period, 388-401 



climate of, 393 



close of, 393 



duration of, 393 



life of, 394 



Silver in Huronian rocks, 334, 337 

 Siphonalia marylandica, 597 

 Sirenians, 571 

 Slate, 294, 393 

 Slichter, C. S., cited, 33, 34 

 Slickensides, 283 

 Slumps, 40 



Smith, E. A., cited, 600 

 Smith. G. O., cited, 607 

 Smith, J. P., cited, 564 

 Snakes, Cretaceous, 549 

 Snow and ice, work of, 121-166 

 Snow-fields, 124 

 Snowflakes, 141 

 Snow-line, 125 

 Soapstone, 291 

 Soil-fertility, 680 

 Solar system, earth in, 2 



evolution of, 301 , 305 

 Solarium trilineatum, 597 



