708 



INDEX 



Marcellus stage, 452. 



Marine deposits, classification of, 235. 



erosion, 202-214. 



life, distribution of, 197. 



plains, ancient, 215-217. 

 New England, 216. 



terraces, 211, 212. 

 Marl, 134. 

 Marsupials, 591. 

 Mass action, 372. ■ 

 Mastodon, 614, 669. 

 Mastodonsaurus, 536. 

 Matthew, W. D., 485, 551, 620. 

 Mature topography, no. 

 Mauch Chunk shale, 488. 

 Mauna Loa, 308. 

 Meanders, 121. 



Mechanical deposits in lakes, 133. 

 Medial moraines, 154, 155, 156. 

 Medina stage, 439, 441. 

 Mediterranean Sea, temperature of, 196, 



197- 

 Medlicottia copei, 483. 

 Meekoceras gracilitatis, 529. 

 Megalonyx, 665, 670, 671. 

 Meganeura monyi, 484. 

 Megatherium, 670. 

 Melina (Perma) maxillata, 629. 

 Melocrinus milwaukeensis, 457, 671. 

 Melting and pressure theory of glacial 



movement, 191. 

 Mer de Glace, movement of, 152. 

 Mesas, 105, 106, 354. 

 Mesohippus, 609. 

 Mesozoic era, 508-571. 



coal of, 571. 



duration of, 520. 



invertebrates of, 523-533. 



life of, 521-569. 



compared with Cenozoic, 572-573. 

 compared with Paleozoic, 521. 



mountain making at close of, 519. 



plants of, 565-569. 

 Metacheiromys, 621. 

 Metamorphic rocks, classification of, 344- 



. , 347 ' 

 definition of, 25. 



development of, 349. 



importance of, 351. 



weathering of, 350. 



Metamorphism, 328, 341, 358. 



by contact, 341-343. 



by pressure, 343. 



Metamorphism — (Continued) 



causes of, 347-348. 



of Archaeozoic, 391. 

 Metamynodon, 606. 

 Mica schist, 346. 

 Micromitra bella, 414. 

 Microzeuglodon, 597. 

 Migration, effect of, on mammals, 636- 



642. 

 Milne, J., 274. 

 Mineral matter in ground water, 58. 



in springs, 64-66. 

 Mineralogy, definition of, 21. 

 Minerals, cleavage of, 685. 



hardness of, 685. 



specific gravity of, 685. 



streak of, 685. 

 Mineral springs, 66. 

 Miocene epoch, 573. 



climate of, 635. 



disturbances on Pacific Coast, 582. 



economic products of, 579-580. 



migration during, 640. 



mountain building of, 582. 



of Atlantic and Gulf coasts, 579. 



of other continents, 584. 



of Pacific coast, 580-582. 



of western interior, 580. 



physical geography of, 579-585. 



volcanic activity of, 581, 583-584. 

 Mississippian period, 401, 469-471. 



close of, 470. 



gypsum of, 470. 



of other continents, 471. 



physical geography of, 469-471. 

 Mississippi River, meanders of, 121, 



122. 

 Mississippi Valley, earthquake of, 279, 



285, 286, 287. 

 Moa, 673. 

 Modioloides, 433. 

 Modiomorpha concentrica, 459. 

 Mceritherium, 612. 

 Mohawkian stage, 422. 

 Mohawk valley, faults in, 262 

 Molds, 379. 

 Mollusca, Cambrian, 413. 



Carboniferous, 481-483. 



Devonian, 457. 



Ordovician, 433-435. 



Silurian, 447-448. 

 Molluscoidea, Cambrian, 414-415. 



Carboniferous, 480-482. 



