INDEX. 



613 



Powell, J.W., cited, i, 519, 521; ii, 



153, 210; iii, 208, 209, 314 

 Pre-Cambrian and Post-Cam- 

 brian evolution, ii, 293 

 Precipitation, i, 50 



from atmosphere, i, 51 



from solution, 1,41,225,239, 

 375-379 



from solution, conditions in- 

 fluencing, i, 225 



from solution, influenced by 

 algae, i, 225 

 Predentata, iii, 97 

 Present Period, iii, 517 

 Pressures within earth, based on 



Laplace's law, i, 564 

 Preston, cited, iii, 437 

 Pxestwich, J., cited, i, 203, 225; 



iii, 515 

 Prestwichia danae, ii, 611, 



613 

 Prlacodon ferox, iii, 105 

 Prima, iii, 91 

 Primates, Eocene, iii, 239 



Miocene, iii, 289 



Pliocene, iii, 323 

 Primitive gneiss, ii, 142 

 Princeton conglomerate, ii, 559 

 Prionotropis woolgari, iii, 189 

 Priscodelphinus, iii, 294 

 Proboscidians, Miocene, iii, 284 



Pliocene, iii, 323 

 Procamelus, iii, 286 

 Prodromites gorbyi, ii, 520 

 Productella, ii, 465, 478 



Mississippian, ii, 528 



pyxidata, ii, 520 



spinulicosta, ii, 462 

 Productids, ii, 465 



Hamilton, ii, 472 , 

 Productive beds, iii, 560 

 Produotus, ii, 465, 615 



arcuatus, ii, 520 



burlingtonensis, ii, 525 



cora, ii, 617 



costatus, 616, 617 



fasciculatus, ii, 532 



Genevieve, ii, 531 



marginicinctus, ii, 532 



Mississippian, ii, 528 



nebrascensis, ii, 616, 617 



semireticulatus, ii, 617, 653 



symmetricus, 11, 616, 617 

 Proetus ellipticus, ii, 520 

 Proganochelys, iii, 44 

 Proganosauria, ii, 649 

 Prognostic geology, iii, 542 

 Progonoblattina columbiana, ii, 

 611 



parviusculus, ii, 349 

 Proptychites, iii, 52 

 Propyl^e, i, 472 



Prospect Mountain limestone, iii, 

 576 



quartzite, iii, 576 

 Prosser, C. S., cited, 1,250, 318, 

 420, 434, 500, 502, 511, 

 540, 542, 546, 558, 560, 

 619, 621, 622, 653; iii, 

 25. n8,554 



Protapirus, iii, 253 

 Proterohippus, iii, 235 

 Proterosauria, ii, 648; iii, 42 

 Permian, ii, 649 



Proterozoic, Adirondack region, 

 ii, 205 



Cordilleran region, ii, 210 



duration of, ii, 198 



eastern provinces of Canada, 

 ii, 204 



Eastern United States, ii, 211 



era, ii, 162 



climate of, ii, 217 



exposures of, ii, 202 



extra- American, ii, 215 



great northern area, ii, 203 



Green Mountains, ii, 213 



Lake Superior region, ii, 

 175 



life, ii, 216 



map of, ii, 147 



Marquette region, N. Mich., ii, 

 174. 176 



Minnesota, ii, 173, 174 



New Jersey, ii, 213 



original Laurentian area, ii, 

 204 



outside Lake Superior region, 

 ii, 202 



relations to Archean, ii, 139, 

 171 



rocks, Black Hills, ii, 174 



rocks, contrasted with Archeo- 

 zoic, ii, 139 



Rocky mountains, ii, 174 



sedimentation, ii, 166 



sediments, extent of, ii, 168 



South Dakota, ii, 173 



southeastern Missouri, ii, 209 



stratigraphic relations of, ii, 

 163 



subdivisions of, ii, 165 



succession, Lake Superior re- 

 gion, ii, 200 



system, rocks of, ii, 169 



Wyoming, 11, 210 

 Protobalanus hamiltonensis, 11, 



47i 

 Protocardia, iii, 134 



levis, iii, 243 

 Protocaris marshi, ii, 283 

 Protoceras, Eocene, iii, 253 



Miocene, iii, 284 

 Protogine, i, 472 

 Protohippus, iii, 286 

 Protolabis, iii, 286 

 Protomeryx, iii, 253 

 Protopterus, ii, 487 

 Protorhyncha antiquata, ii, 



285 

 Protorosauria, iii, 647 

 Protorthis billingsi, ii, 298, 299 

 Protostega, iii, 180 

 Protov, arthia cancellata, ii, 353 

 Protozoa, Cambrian, ii, 287 



Carboniferous, ii, 616, 618 



Devonian, ii, 467 



Genevieve, ii, 531, 532 



geologc contribution of, i, 

 660 



Protozoa, Ordovician, ii, 361 



Protremata, ii, 356 



Provinces, general, of Triassic 



system, iii, 38 

 Provincial development of Ordo- 

 vician life, ii, 343 



faunas, i, 668 

 Provincialism, human, iii, 540 

 Proviverra, iii, 237 

 Psammochelys, iii, 44 

 Psaronius, Devonian, ii, 493 

 Pseudomiltha, iii, 292 

 Pseudomonotis curta, iii, 93 

 Pseudomorphs, i, 465 

 Pseudopecopteris, Mississippian, 



ii, 537 

 Psilomelane, i, 465 

 Psilophyton, ii, 494 

 Psychological factors, i, 651 

 Pteranodon, iii, 179 

 Pteraspis, ii, 484, 485 

 Ptendophytes, ii, 592 



Devonian, ii, 492, 493 



geologic contribution of, i, 657 



Triassic, iii, 38 

 Pteridospermae, Devonian, ii, 493 



Pennsylvanian, ii, 595 

 Pterinea demissa, ii, 354 



emacerata, ii, 403 



flabella, ii, 471 

 Pterodactyls, Jurassic, iii, 102 

 Pterodactylus, iii, 101 



spectabilis, iii, 103 

 Pteroperna, iii, 91 

 Pterophyllum, iii, 39 

 Pteropod ooze, i, 380, 382 

 Pteropods, Cambrian, ii, 298 



Chemung, ii, 478 



Devonian, ii, 473 



Mississippian, ii, 523 



Silurian, ii, 407 

 Pterosauria, iii, 42, 43 



Cretaceous, iii, 179 



Jurassic, iii, 101 

 Pterotocrinus bifurcatus, ii, 532 

 Pterygometopus callicephalus, ii, 



349 

 Pterygotus, ii, 412 



Devonian, ii, 490 

 Ptilophyllum, iii, 95 

 Ptilophyton, ii, 4^4 

 Ptychoceras crassum, iii, 189 

 Ptychopana, 11, 299 



antiqua, ii, 299 



kingi, 11, 298, 299 

 Ptychosalpinx, 111, 295 

 Puerco formation, iii, 207 

 Puget formation, iii, 202, 203 

 Pugh formation, iii, 548 

 Pugnax uta, ii, 616, 617 

 Pulaski formation, in, 202 



shale, ii, 559 

 " Pulp't rocks," i, 350 

 Pumice, 1, 406, 453, 472 

 Pumpelly, R., cited, 11, 198; iii, 



411 

 Pupa vermilionensis, ii, 611 

 Purbeck beds, iii, 76 

 Purington, C. W. cited, in, 69, 

 207. 209 



