INDEX 



955 



Devonian continued 



gas and oil, 571 



igneous rocks, 571 



life, 575 



Lower, 561 



Middle, 561 



oil and gas in, 571 



of Africa, 574 

 Asia, 574 

 Australia, 574 

 Europe, 572 

 Great Basin, 568 

 the northwest, 569 

 South America, 575 

 West, 567 



period, 559-595 



duration of, 571 



sea life, 575 



thickness of, 568 



Upper, 565 

 DeVries, H., 504 

 Diabase, 30, 83 

 Diallage, 76 

 Diastrophism, 2, 338 



in sea, 292 



of Cambrian, 479 

 Diatomaceous beds and oil, 808 

 Diatom ooze, 38, 83, 329 

 Diceratherium, 823 

 Dichocrinus inornatus, 608 

 Dichograptus octobrachiatus, 531 

 Dicotyledons, 761 

 Dicranurus hamatus, 576 

 Dictyopteris rubelia, 645 

 Didymograptus nitidus, 531 

 Dielasma bovidens, 658 

 Dikellocephalus fauna, 483 

 Dikes, 15, 367 

 Diller, J. S., 393, 409, 707, 733, 752, 



810, 811, 814, 911, 913 

 Dimorphodon, 723 

 Dinichthys, 583 

 Dinoceras mirabile, 790 

 Dinocerata, 789 

 Dinosaurs, Cretaceous, 762 



Jurassic, 720 



ornithopod, 721 



Triassic, 693 

 Dinotherium, 843 

 Diorite, 29, 60, 83 

 Dip, 40, 400 



fault, 65 



Diplograptus, pristis. 531 

 Diplopodia texanum, 740 

 Discorbina turbo, 795 



Dismal Swamp, 632, 634 



Displacement of faults, 409 



Distributive fault, 64 



Dittmar, W., 289 



Dodge, R. E., 191 



Dogger, 709 



Dolerite, 30, 60, 83 



Dolomite, 37, 83, 325 



Dolomization, 37 



Dome of crust, strength of, 365 



Don formation, 917 



Donetz, coal-field of, 604 



Dosiniopis lenticularis, 796 



Double Mountain formation, 661 



Drainage, changes in effected by 



glaciation, 873 

 Drake, N. F., 778 

 Drepanochilus nebrascensis, 768 

 Drift, 11, 83, 256, 849 



characteristics of, 858 



constitution of, 850 



deposition of, 262, 864 



distribution of, 853 



relief of, 856 



southern limit of, 863 



structure of, 852 



thickness of, 855 



topography of, 855 



wear in transit, 262 

 Drowned valleys, 176 

 Drumlins, 864, 865 

 Dryptosaurus, 762 

 Dumble, E. T., 774, 829 

 Dunes, 93 



distribution of, 98 



migration of, 97 

 Dunkard series, 621 

 Duration of Mississippian period, 



606 



Dust, wind-blown, 89 

 Dutton, C. E., 153, 338, 348, 364, 



366, 393, 835 

 Dwarfed faunas, 615 

 Dwyka conglomerate, 667 

 Dyas, 663 



Dynamic geology, 1 

 Dynamic sources of heat in ice, 248 



Early stages of earth's history, 430 

 Earth, and sun, 3 



dimensions of, 7 



form of, 7 



interior of, 10 



origin of, 415 



specific gravity of, 10 



