698 



INDEX 



Lake Agassiz, 640, 641 

 Algonquin, 639 

 Arkona, 638 

 basins, origin of, 205 

 Bonneville, 203, 656, 657, 658 

 Champlain, 639, 641 

 Chicago, 636, 637 

 cliffs, 179 



deposits, glacial, 660 

 Duluth, 637 

 ice, 121 

 Iroquois, 639 

 Lahontan, 658 

 Maumee, 636, 637 

 Michigan, history of, 636 

 Superior region, Proterozoic history, 



338 

 Proterozoic rocks, 331 



Warren, 638, 639 



Whittlesey, 638 

 Laminje, 269 

 Lance formation, 539 

 Land animals, Quaternary, 666 

 Land snails, 467 

 Landslides, 40 

 Laplacian hypothesis. See nebular 



hypothesis. 

 Laramie coal, 538 

 Laramie series, 535, 538 

 Lariosaurus balsami, 496 

 Lateral moraines, 136, 156, 160 

 Lateral movements, crustal, 223 

 Lateral planation, 68 

 Lava, 235, 250 



crystallization of, 251 



nature of, 238 



rise of, 226, 242, 244, 245 



source of, 240 



temperature of, 240 

 Lava cones, 236 

 Lava flows of the Deccan, 229 



of Iceland, 229 



of Lake Superior, 229 



of the northwest, 230 

 Lassen Peak, 232 

 Lawson, A. C., cited, 604, 663 

 Lead and zinc of Missouri, 427 

 Lead coral, 400 

 Lead ores, Ordovician, 374 

 Leadville limestone, 429 

 Lecanocrinus macropetalus, 395 

 LeConte, J., cited, 226, 604, 606 

 Leda concentrica, 595 



glabra, 531 



parilis, 573 



Lee, W. T., cited, 539 



Leith, C. K., cited, 45, 321, 325, 331. 



334, 337 



Lepadocystis moorei, 384 

 Leperditia dermatoides, 359 

 Lepidodendrons, 424, 459, 461, 462, 



476 



Lepidodiscus cincinnatiensis, 384 

 Lepocrinites gebhardii, 414 

 Laptasna rhomboidalis, 382, 414, 435 

 Lepterpeton dobbsi, 465 

 Leptopora placenta, 433 

 Leucophyres, 262 

 Levees, 112 

 Leverett, F., cited, 628, 632, 634, 645, 



676 



Life, beginning of, 312 

 Life and glacial periods, 663 

 Life of interglacial epochs, 664 

 Lima wacoensis, 530 

 Limestone, 194, 267, 268 

 Limestone sinks, 39 

 Limonite, 255, 256 

 Lincoln, D. F., cited, 628 

 Lindgren, W.. cited, 561, 586 

 Lingula brevirostra, 512 



rectilateralis, 382 



umbonata, 469 

 Lingulepis pinniformis, 360 

 Liriodendron giganteum, 547 

 Lithosphere, 5 



composition of, 7 

 Lithic era, 307 

 Littoral currents, 175, 186 

 Littoral deposits, 189 

 Livingston formation, 539 

 Lizards, Cretaceous, 549 

 Llamas, 666 

 Lockport limestone, 388 

 Loess, 13, 14, 642, 645 



accessories, 645 



age of, 643, 644 



origin, 645 



thickness, 645 

 Loess fossils, 644 

 Lophospira helicteres, 381 

 Lorraine beds, 368 

 Loup Fork formation, 586. 592 

 Lower Cambrian, 344 

 Lower Carboniferous. See Missis- 



sippian 



Lower Carboniferous of Europe, 430 

 Lower Cretaceous of Europe, 527 

 Lower Huronian, 331 

 Lower Magnesian limestone, 369 



