IXDEX 



691 



Silurian pelecypods, 403, 406 



period, 368 



pteropods, 407 



sponges, 408 



starfishes, 401 



system, subdivisions of, 370 



trilobita, 403, 408 



in the West, 390 

 Simonds, F. W., cited, 424, 562 

 Sioux quartzite, 173, 205 

 Slickensided surfaces, meteorites, 



26 

 Smith, G. O., 395. 555 

 Smith, J. P., cited, 639 

 Smith : W. S. T., cited, 209, 505 

 Smyth, W. S., 149, 178, 179. 180 

 Solar nebula, origin of, 51 

 Solidity of earth, astronomical 



argument for, 7 

 Soudan formation, 150 

 South Africa, Permian of, 635 

 South America, Permian of, 638 

 Spacing out of planets, 78-80 

 Spencer, A. C, cited, 435 

 Spermatophytes, Devonian, 493 

 Sphaerexochus mirus, 403 

 Sphenophyllales, Carboniferous, 

 597, 598 



Devonian, 493 



Mississippian, 537 

 Sphenophyllum, 602 



Devonian, 493 



longifolium, 597 



Permian, 643 

 Sphenopteris, 595, 602, 643 



Mississippian, 537 



splendens, 593 

 Sphere of activity, 62 

 Spiders, Carboniferous, 611 

 Spiral nebulae, motions of, 43 



origin of, 58 

 Spirifer acuminatus, 462, 465 



arenosus, 458, 465 



biplicatus, 520 



cameratus, 615,616,617 



disiunctus, 475, 476, 520, 521 



increbescens, 532 



logani, 525 



macropleurus, 455 



marionensis, 520, 521 



murchisoni, 458 



niagarensis, 403 



pennatus, 471 



radiatus, 403, 409 



Silurian, 404 



striatus, 525, 528 



suborbicularis, 52s 



tullius, 475, 476 

 Spiriferina, 531, 615 



kentuckiensis, 616, 617 



spinosa, 532 

 Spirifers, Devonian, 475 



Genevieve, 531 



Hamilton, 472 



Mississippian, 531 



Onondagan, 464 



Pennsylvanian, 615 

 Sponges, Cambrian, 287 



Devonian, 467 



Ordovician, 363 



Sponges, Osage, 525 



Silurian, 408 

 Spring Creek black shale and 



limestone, 562 

 Springer, F. (and Wachsmuth, 



C), cited, 400, 523, 526 

 Spurr, J. E., cited, 308, 390, 436, 



506, 552 

 Starfishes, Mississippian, 523 



Silurian, 401 

 Stassfurt, salts of, 630 

 Staurocephalus, 411 



murchisoni, 403 

 Stellar collision, 53 

 Stenotheca rugosa, 284 

 Stereosternum, 649 

 Sternbergia, 601 

 Stigmaria, 600, 602 

 Stoek, H. H., cited, 546 

 Stoney, G. Johnstone, cited, 92, 



93 

 Straparollus obtusus, 520 

 Stratigraphy and paleontology, 



242 

 Straw formation, 563 

 Streptelasma corniculum, 361 

 Streptis, 411 

 grayi, 403 

 Stromatopora, 361, 457 



delicatula, 358 



Stropheodonta, 464, 478 



concava, 462 



magnifica, 458 



profunda, 403 



Stropheodonts, Devonian, 464 



Strophomena, 456 



subtenta, 356 

 Strophonella punctulifera, 455 

 Strotospongia maculosa, 363 

 Structure of earth on nebular 

 hypothesis, 133 

 on planetesimal hypothesis, 

 134 

 Sturgeon quartzite, 179, 180 

 Styliola, 473 

 Sub-Carboniferous period, 496 



(see also Mississippian) 

 Sub-oceanic and continental sec- 

 tors, 123 

 Subulites regularis, 353 



ventricosus, 403 

 Succession of faunas, Cambrian, 

 294 

 Ordovician, 364 

 Sunbury formation, 500, 560 

 Suess, E., cited, 129, 589 

 Surface temperature on plane- 

 tesimal hypothesis, 69 

 Swedenborg, cited, 4 

 Sycamore limestone, 511 

 Sylamore sandstone, 562 

 Synapsida, 647, 649 

 Synbathocrinus wortheni, 525 

 Syringopora, Silurian, 407 



verticillata, 406 

 Syringothyris subcuspidatus, 525 



Taconic mountains, folding of, 

 333 

 Ordovician of, 326 



Taconic system, 335 

 Taeniaster cylindricus, 359 

 Taeniopteris, 643 



newberriana, 643 

 Taff, J. A., cited, 209, 224, 308, 

 321, 435, 504, 5ii, 543, 

 548 

 Talchir formation, 634 

 Tasmania, Cambrian fossils of, 



300 

 Tealoresco, E. C, cited, 605 

 Teleostomi, 461 

 Tellico sandstone, 316 

 Telotremata, 356 

 Temnospondyli, 607, 609 

 Temperature and C0 2 of ocean, 

 667 



developed by infall of plane- 

 tesimals, 68 



of surface on planetesimal 

 hypothesis, 69 

 Tennessee, Devonian phosphates 

 of, 440 



Ordovician phosphates of, 337 

 Tensional movements, origin of, 



131 

 Tentaculites, 478 

 Terebratula, 472 

 Tetradella quadrilirata, 351 

 Tetragraptus, 364 



bigsbyi, 362 



fruticosus, 362 

 Texas, Permian of, 623 

 Thallophytes, Devonian, 493 

 Thermal efficiency of atmosphere, 



674 

 Theromorpha, 649, 650 

 Three Forks shale, 153 

 Tidal disruptions, 22 

 Todd, J. E., cited, 205, 308 

 Tolman, C. F., cited, 666 

 Tornebohm, A. E., cited, 159, 



216 

 Tornoceras mithrax, 463 

 Tower, G. W., cited, 266 

 Trachydomia wheeleri, 616 

 Traquair, R. H., cited, 489, 653 

 Tree ferns, Devonian, 493 

 Tremadoc beds, 342 



slates, 271 

 Tremataspis, 484, 485 

 Trematis millipunctata, 356 

 Trenton limestone, 310 

 Triarthus beckii, 350 

 Trigonocarpus, Mississippian, 537 

 Trilobites, Cambrian, 281, 297 



Carboniferous, 616, 618 



Devonian, 467, 477 



Genevieve, 533 



Hamilton, 473 



Helderbergian, 456 



Kinderhook, 520, 521 



Mississippian, 525 



Ordovician, 347, 349 



Oriskany, 459 



Silurian, 403, 408 



Upper Cambrian, 300 

 Trimerella, 404 



acuminata, 403 



ohioensis, 403 



