944 
Cythere, 669, 73 
Cytherea, 820, 840, 854*, 855, 862, 896 
Dachschiefer, 122 
Dachstein Limestone, 769 
Dacite, 144 
Dacrytherium, 856 
Dactylopora, 848 
Dadoxylon, 708, 730 
Dakosaurus, 795 
Dakotah Group, 832 
Dalmanites, 689, 696 
Dalveen Group, 671 
Dammara, 834 
Damourite, 74 
Danian, 814, 823, 827, 835 
Danube, mineral matter in water of, 366, 
370; area of drainage, 444 ; annual dis- 
charge of sediment by, 444; rate of 
erosion by, 444; loess of, 384; growth of 
delta of, 390 
Daonella, 762 
Dapedius, 775 
Daphne, 862 
Dasornis, 846 
Dasyceps, 755 
Davidia, 652 
Dausonia, 754 
Day, change in length of the, during the 
geological past, 13, 20 
Dead Sea, composition of water of, 398; 
chemistry of, 399; saline deposits of, 
111, 399; asphalt of, 173 
Deccan “ traps,” 258, 831 
Declivity and denudation, 921 
Decomposition products, 107, 123, 161 
Deer, fossil, 868, 872, 875 
Deformation of internal parts of rocks, 157, 
311, 521 
Deinoceras, 843* 
Deinoceras Beds, 853 
Deinocerata, characters of, 842 
Deinosaurs, earliest forms of, 763, 778; the 
most gigantic forms of life, 779, 801 
Deinotherium, 863, 864*, 871 
Delessite, 82 
Delta, formation of in lakes, 385, 393; in 
the sea, 388; burial of organisms in, 605 
Dendritic markings, 70 
Dendrocrinus, 650 
Dendrograptus, 667 
Denmark, progress of dunes of, 824; peat 
mosses of, 459; shell mounds of, 909; 
Cretaceous rocks of, 828; boulder drift 
of, 890 
Density, alteration of distribution of ter- 
restrial, 275 
Dentalium, 819, 878, 897 
Denudation by wind, 320, 321; by solvent 
action of rain, 332; subaerial, 441; 
rate of, 444; unequal in its progress, 
343, 446; exaggerated ideas of marine, 
447; rate of marine, 447; marine com- 
pared with subaerial, 448 ; 
final resul's 
INDEX. 
of marine, a plain, 449; affected by 
subterranean movements, 288, 448, 911, 
912; influence of upon the contours of 
the land, 911,921 — 
Deoxidation, by organic matter of rain, 
332 
Deposition connected with pobsitlende 
288; synchronous and coequal with de- 
nudation, 451; vast extent of, 451; con- 
ditions of indicated by nature of strata, 
475 
Depression (see Subsidence) 
Deserts, sand dunes of, 323, 325 
Desiccation, effects of, 319, 327, 395 ; some- 
times caused by cutting down forests, 
454 
Desiceation cracks, 485 
Desmosite, 578 
Destructive action in geology, 316, 452 
Detrital rocks, 102 
Devillien (Systeme), 658 
Devitrification, 99, 100, 102, 104, 105, 298 ; 
may arise from meteoric action, 333 
Devonian system, 693, 695; origin of name, 
699 ; Devonian and Old Red Sandstone 
types, union of, 704, 718 
Dew removes impurities from the air, 331 _ 
Diabase, 145, 146 
Diabase-aphanite, 145 
Diabase-porphyrite, 146 
Diadema, 773, 805* 
Diallage, 76 
Diallage rock, 149 
Diastopora, 723, 793 
Diatom earth or ooze, 168, 461 
Dicellograptus, 663 
Diceras, 797 
Diceratherium, 869 
Dichobune, 841, 857 
Dichodon, 841, 857 
Dichograptus, 658 
Dichroism, 79, 190 
Dichroite, 79 
Dicotyledons, earliest forms of, 803, 832 
Dicranograptus, 663* 
Dictyocaris, 664 
Dictyonema, 658 
Dictyonema schist, 658 
Dictyopteris, 733 
Dictyoxylon, 735 
Didelphys, 846 
Didymaspis, 712 
Didymograptus, 663* 
Diester Sandstone (Neocomian), 828 
Dikelocephalus, 649*, 651 
Diluvial deposits, 883 
Diluvium, 888 
Dimetian rocks, 643 
Dimorphodon, 778 
Dinichthys, 705, 710 
Dinobulus, 691 
Dioonites, 772 
Diopside, artificial formation of, 300, 301 
Diorite, 143 ; bosses of, 545 
