INDEX 



697 



Idonearca nebrascensis, 554 



us eruptions, Pleistocene, 657 

 Igneous rocks, 9, 246 

 classification of, 258 

 composition, 251 

 Cretaceous, 542 

 Devonian, 410 

 disruption of, 263 

 I .K-ene, 561 

 Huronian, 332 

 Keweenawan, 334 

 Miocene, 587 

 Mississippian, 429 

 occurrence, 246 

 Ordovician, 370 

 Silurian, 393 

 >t ructure of, 246 

 I lUvilk-waet Glacier, 158 

 Illinoian drift, 634 

 Illinoianicesheet, 633 

 Ilmenite, 260 

 Ilyanassa (?) procina, 597 

 I mmediate run-off, 58 

 Imperial Valley, 118 

 India, glacial Permian in, 474 

 Inoceramus vanuxemi, 554 

 Insectivores, Eocene, 571 

 Insects, Devonian, 424, 425 

 Eocene, 572 

 Oligocene, 578 

 Ordovician, 387 

 Pennsylvanian, 467 

 Interglacial beds, Toronto, 664, 665 

 Interglacial epochs, 633, 664 

 Interior heat, 225 

 Intermediate rocks, 252 

 Intermittent streams, 58 

 Intrusive rocks, 227 

 lone formation, 586 

 lowan drift, 635, 664 



ice sheet, 633 

 Iron ore, 269 

 Archean, 333 

 Clinton, 43, 389 

 Huronian. 332 

 Lake Superior, 43, 332 

 Pennsylvanian, 454 

 Iron oxides, 254 

 Ischadites, 386 

 Isocardia markoe'i, 595 

 Isoclinal fold, 276 

 Isocline, 275 

 Isotelus maximus, 378 



James River, 105 



asper, 254 



elly fish, Cambrian, 362 

 erseyan drift, 633 

 ohn Day Basin, 575 

 ohnson, L. C., cited, 600 

 oints, 278-281 

 influence on erosion, 99 

 udd, J. W., cited, 245 

 urassic ammonites, 508 

 coal, 507 

 fossils, 507 

 plants, 515 

 urassic period, 502-520 

 close of, 505 

 urassic system, 503 

 thickness of, 505 

 urassic of Arctic lands, 507 



Cansan glacial stage, 633, 634 

 Caolin, 257, 266 

 Cames, 165, 631 

 Came terraces, 631 

 Carroo beds, 479 

 Kaskaskia series, 426 

 iayser, E., cited, 457 

 Ceewatin ice sheet, 613 

 tCenai series, 559 

 Settles, 629 

 [Ceuper formation, 491 

 Keweenawan period, 331, 335 

 Keweenawan rocks, 331, 334, 335 

 Kinderhook fauna, 432, 433 

 Kinderhook formation, 426 

 King, C., cited, 606 

 King, F. H., cited, 33 

 Kingston beds, 402 

 Kittatinny Mountain, 105 

 Kitta tinny peneplain, 104 

 Knobs, 628, 629 



Knowlton, F. H., cited, 539. 561, 574 

 Knox dolomite, 369 

 Knoxville series, 525 

 Kootenay formation, 525, 526 

 Krakatoa, dust from, 13 



eruptions of, 237 



Kiimmel, H. B., cited, 203, 487, 523 

 Kutorgina cingulata, 360 



Labradorean ice sheet, 613 

 Labrador! te, 254 

 Labyrinthodonts, 440, 465 

 Laccoliths, 228 

 Lacustrine deposits, 202, 652 

 Lafayette formation, 600, 602, 653 

 Lakes, 201-205 

 changes in, 201 



