692 



INDEX. 



Trinucleus concentricus, 367 



ornatus, 349 

 Trocholites ammonius, 352 

 Trochus saratogensis, 284 

 Troostocrinus reinwardtii, 403 

 Tropidoleptus carinatus, 471 , 472 , 



478 

 Tropitidse, 655 

 Tschermak, G., cited, 27, 28 

 Tschernyschew, T., cited, 391 

 Tully formation, 432 



limestone, 477 

 Tyler slate, 186^189 

 Tyrrell, J. B., cited, 426 



Ulodendron, Mississippian, 537 

 Ulrich,E. O., cited, 221, 225, 310, 

 367 (and Hayes, C. W.), 

 316, 321, 335, 427, 434. 440 

 (and Schuchert, C). 250, 

 312, 321, 344, 411. 427. 432 

 (and Winchell, M. H.), 314 

 Uncinulus mutabilis, 455 

 Unconformities in coal measures, 

 -'- 574 



Unicoi formation, 152 

 Upper Barren Coal Measures, 



542 

 Upper Burlington limestone, 561 

 Upper Cambrian, 225 

 annelids, 299 

 brachiopods, 299, 300 

 cephalopods, 299 

 corals, 299 

 cystids, 299 

 gastropods, 299, 300 

 pelecypods, 299 

 trilobites, 299, 300 

 Upper Devonian, 430 



map, 431 

 Upper Permian, gypsum in, 630 



salt beds of, 630 

 Upper Productive Coal Measures, 



54i 

 Upper Silurian (see Silurian) 



period, 368 

 Usiglio, cited, 661 

 Utica shales, 310 



Van Hise, C. r R., cited, 138, 139, 

 143, 145, 146, 149, 150, 153, 

 155, 158, 176, 178, 179, 180, 

 181, 186, 187, 188, 191, 198, 

 199, 205, 206, 208, 213, 214 

 (and Hoskins, L. M.), 258 



Vanuxem, L., cited, 310 



Vanuxemia dixonensis, 354 



Variscan Alps, 589 



Velocity from infinity, 55 



Vermilion district, 150 



region, Animikean of, 190 

 (Minn.) region, Huronian of, 

 180 



Vertebrata, Kinderhook, 519 

 Ordovician, 347 



Very, F. W., cited, 674 



Virginia slate, 190 

 Vishnu terrane, 153 

 Vitulina pustulosa, 471, 472 

 Volcanic action, climax of, 116 

 differentiation of earth matter, 



120 

 eon, 91 

 Voltzia, 645, 646 



heterophylla, 645 

 Vulcan formation, 187 

 Vulcanism, dynamics of rise of 

 lava, 103 

 heat of, from compression, 10 1 

 from condensation, 100 

 from infall, 100 

 from molecular rearrange- 

 ment, 101 

 necessary for, 100 

 initiation of, 99 

 mode of, 102 

 source of, 100 



time relations to atmosphere, 

 106 



Waagenoceras cumminsi, 654 

 Wachsmuth, C. (and Springer, 



F.), cited, 400, 523, 526 

 Walchia, 645 



piniformis, 644 

 Walcott, C. D., cited, 153, 210, 

 218, 224, 225, 240, 249, 263, 

 264, 265, 280, 283, 296, 324, 

 334, 335, 347, 348, 366, 4", 

 435, 506, 623 

 Warsaw formation, 561 

 Washington sandstone and shale, 



562 

 Water-lime, 389, 424 



fauna, 412 

 Waverly brachiopods, 527 

 crinoids, 526 

 fauna, 526 

 formation, 560 

 pelecypods, 527 

 series, 502 

 shales, 511 

 Weber formation, 154 



limestone, 563 

 Weed, W. H., cited, 153, 210, 



267, 436 

 Weeks, F. B., cited, 280, 506, 



553 

 Weller, S., cited, 318, 349, 359, 

 378, 403, 4io, 411, 425, 436, 

 438, 452, 453, 455, 458, 463, 

 474, 475, 501, 520, 525, 526, 

 532, 617 (and Kummel, H. 

 B.),265 

 Wenlock series, 396 

 Western interior coal-field, 548 

 Wewee slate, 150, 179 

 White, C. D., cited, 635 

 White, D., cited, 509, 540, 546, 



595 

 White, I. C, cited, 440, 540, 558, 

 574. 619, 638 



Whiteaves, J. F., cited, 280, 429 



Whitfield, R. P., cited, 280 



Whitney, J. D. (and Hall, J.), 

 cited, 314 



Whittle, C. L., 211 



Wichita formation, 623 



Wilder, F., cited, 621 



Williams, G. H., cited, 145, 439 



Williams, H. S., cited, 384, 391, 

 395, 420, 424, 452, 475, 477, 

 500, 530, 562 (and Gregory, 

 H. E.)i cited, 422, 434 



Willis, B., cited, 210, 300, 584 

 (and Blackwelder and Sar- 

 gent), 273 



Williston, S. W. 5 cited, 624 



Willmott, A. B., cited, 181 



Winchell, Alex., cited, 10 



Winchell, N. H., cited, 150, 320 

 (and Ulrich), 310, 314 



Winslow, A., cited, 337, 575 



Wisconsin, lead in, 337 

 map of southern, 393 

 zinc in, 337 



Wise formation, 559 



Wolff, J. E., 213 



Wood, composition of, 569 



Woodford chert, 435 



Woodward, A. S., cited, 487, 488, 

 489, 534, 650 



Woodward, R. S., cited, 236 



Woodworth, J. B., cited, 544. 

 549 



Worthen, A. H. (and St. John), 

 cited, 534 



Worthenia tabula ta, 616 



Wright, Thomas, cited, 4 



Wyman sandstone, 562 



Xenoneura antiquorum, 494 



Young, C. A., cited, 542 

 Yule limestone, 154 



Zaphrentis centralis, 525 



gibsonii, 616 



gigantea, 463 



ponderosa, 462 



Silurian, 407 



umbonata, 406 

 Zaptychius carbonaria, 528 

 Zechstein, 628 

 Zeiller, R., cited, 591 

 Zinc in Illinois, 337 



in Iowa, 337 



in Missouri, 337 



in Ordovician, 337 



in Wisconsin, 336 

 Zittel, K. A., cited, 413 

 Zone of accommodation, 130 

 Zonites priscus, 611 

 Zoological provinces of Cam- 

 brian life, 292 

 Zygospira exigua, 356 



recurvirostris, 356 



