692 



INDEX 



Currents in streams, 77 

 Currents, ocean, 188 

 Cushetunk Mountain, 94 

 Cut-offs, 114 



Cycadeoidea dakotensis, 529 

 Cycads, Comanchean, 529 



Jurassic, 515 

 Cycle of erosion, 66, 103 



stages in, 69 

 Cyclomena bilix, 381 

 Cyphaspis christyi, 399 

 Cypricardella bellistriatus, 419 

 Cyrtoceras neleus, 380 

 Cyrtolites ornatus, 381 

 Cystids, 362 



Ordovician, 383 



Pennsylvanian, 468 



Silurian, 396 



Daedicurus clavicaudatus, 669 



Dakota formation, 535, 536 



Dall,W.H., cited, 556,574, 581, 596,611 



Dalmanella testudinaria, 382 



Daly, R. A., cited, 103 



Dana, J. D., cited, 179, 226, 245, 307 



Darton, N. H., cited, 575 



David, T. W. E., cited, 357, 413 



Davis, B. M., cited, 37 



Davis, C. A., cited, 202 



Davis, W. M., cited, 13, 68, 118, 487, 



560, 606, 628, 645 



Dawson, G. M., cited, 429, 526, 641 

 Dawson, J. W., cited, 641 

 Dead Sea, 204 

 Debris in ice, 53 

 Deccan lava flows, 544 

 Deep-sea deposits, 189, 196 

 Deer, earliest, 592 

 Degradation, rate of, 84 

 Dehydration, 291, 292 

 Deiphon forbesi, 399 

 Delaware River, 105 

 Delaware Water-Gap, 92 

 Delta fingers, 117 

 Delta of the Mississippi, 115 

 Deltas, 108, 116, 117 

 Dendrocrinus polydactylus, 384 

 Dentalium attenuatum, 597 

 Denver formation, 539 

 Deposition by shore-currents, 184 



by streams, 107 



by undertow, 184 



by waves, 184 



of drift, 156 



of mineral matter from solution, 37 



Deposits in sea, 172, 189 

 Deposits by springs, 652 

 Derbyia crassa, 469 

 Deroceras subarmatum, 508 

 Desert sandstone, 545 

 Des Moines series, 443 

 Devonian, climate of, 413 

 Devonian fauna in Great Basin, 420 



fishes, 416, 418 



floras, 423 



igneous rocks, 410 

 Devonian land life, 421, 423 



life, 413 



Devonian oil and gas, 410 

 Devonian period, 402-425 



close of, 410 

 Devonian phosphates, 411 



system, outcrops of, 410 

 Diabase, 261 

 Diallage, 260 

 Diastrophic movements, periodic, 219, 



220 

 Diastrophism, 2, 170, 206 



of Archeozoic era, 318 



of Jurassic, 505 



of Middle Miocene, 584 



of Permian, 475 



of Quaternary, 66 1 

 Diatom ooze, 199 

 Dichocrinus inornatus, 433 

 Dichograptus octobrachiatus, 385 

 Dicranurus hamatus, 414 

 Dictyopteris rubelia, 460 

 Didymograptus nitidus, 385 

 Dielasma bovidens, 469 

 Dikellocephalus fauna, 349 

 Dikellocephalus pepinensis, 348 

 Dikes, 228 



Diller, J. S., cited, 586, 606, 663 

 Dinichthys herzeri, 418 

 Dinoceras mirabile, 569 

 Dinocerata, 568 

 Dinosaurs, 494 



Cretaceous, 546 



Jurassic, 515 

 Dinotherium, 610 

 Diorite, 260, 261, 262 

 Dip, 275 



Diplograptus pristis, 385 

 Diplopodia texanum, 530 

 Dipnoi, 422 



Dipterus valenciennesi, 423 

 Discorbina turbo, 572 

 Divides, permanent, 63 

 Dolerites, 262 



