706 



INDEX 



Iron ore — (Continued) 



in Pennsylvanian, 475. 



in Proterozoic, 396. 



sedimentary deposits, 374. 

 Isoclines, 254. 



Isolation, effect on faunas, 636-642. 

 Isostasy, 365-367. 

 Isotelus gigas, 435. 



Jeffrey, E. C, 500, 501. 

 Jellyfish, 416. 

 Jerseyan stage, 649. 

 Johnstown flood, 82, 83. 

 Joints, 258-260. 



influence on erosion by streams, 88. 

 on topography, 260. 

 on wave erosion, 207, 208. 

 on weathering, 29, 39. 



origin of, 259. 



vertical, cause of fall, 92. 

 Jorullo, volcano, 295. 

 Jupiter Serapis, Pozzuoli, temple of, 



229. 

 Jurassic period, 508. 



climate of, 570. 



mountain forming of, 513. 



of Atlantic and Gulf coasts, 512. 



of other continents, 513-514. 



of western interior, 512. 



physical geography of, 512-514. 



Kaaterskill Creek, 108. 

 Kahl, 51. 

 Karnes, 181-182. 

 Kansan glacial stage, 649. 

 Karst topography, 72-73. 

 Katmai, volcano, 305. 

 Keewatin ice sheet, 646. 

 Kemp, J. F., 332. 

 Kettle holes, 179. 

 Keuper formation, 512. 

 Keweenawan system, 388. 

 Kilauea, 308. 

 King, F. H., 44, 131. 

 Kittatinny peneplain, 516. 

 Klamath Mountains, 581. 

 Knowlton, F. H., 634. 

 Kootenai formation, 515. 

 Krakatao, 304-305. 

 Kntorgina cingulata, 414. 



Labidosaurus, 490. 

 Labradorean ice sheet, 646-647. 

 Labradorite feldspar, 689. 

 Laccolith mountains, 354-355. 

 Laccoliths, 327. 



Laccoliths of Henry Mountains, 519. 

 Lafayette formation, 586. 

 Lake Agassiz, 656. 



Algonquin, 653. 



Bascom, 656. 



Bonneville, 137, 657. 



Chicago, 653. 



Duluth, 653. 



Iroquois, 655. 



Lahontan, 657. 



Lundy, 653. 



Marjelen, 186. 



Maumee, 653. 



Nipissing, 655. 



Superior formations, 375. 

 iron deposits of, 375. 

 Proterozoic of, 393. 



Tanganyika, 267. 



Tulare, 125, 126. 



Warren, 653. 

 Lakes, dammed by glaciers, 186. 



deposition in, 133-135, 250. 



extinct, 136-138. 



formed by alluvial fan, 126. 

 dam of drift, 186. 

 earthquakes, 288, 289. 

 landslide dam, 74, 75. 

 lava dam, 321. 

 morainic dam, 160. 

 natural levees, 124. 

 sand-dune dam, 50. 

 talus dam, 39. 



in cirques, 145. 



in craters, 321. 



in glacial drift, 186. 



in glaciated valleys, 165. 



in moraines, 175. 



in overdeepened river valleys, 186. 



in rock basins, 186. 

 Lakota formation, 515. 

 Lambdotherium, 604. 

 Lamina?, 24, 234. 

 Lance formation, 518, 572, 624. 

 Landslides, 62, 207. 



causes of, 73-75, 289. 



form falls, 93. 

 Landslide topography, 75. 

 Lapilli, 332. 



