436 
INDEX 
Pirsson, L. V., quoted, 115 
Plug mountains, 30 
Polyhalite in Texas, 249 
Pompeckj, J. F., quoted, 193 
Portrait of Samuel Calvin, 177 
Potash, age, 250; Texas, 249 
Potash Wells in Texas, by J. A. 
Udden, 344 
Posepny, F., cited, 228, 277, 379 
Possible Secondary Character of 
Colemanite, by C. Keyes, 411 
Potter, W. B,, cited, 134 
Pourquoi Pas, dredging, 255 
Powell, J. W., mention, 57 
Prairie tectonics, 175 
. Pratt, J. H., Magnetitic Ores of N. 
Carolina, 345; Triassic Coal of 
N. Carolina, 246 
Pre-Cambrian terranes, 320 
Precordillera of San Juan and Men¬ 
doza, Argentina, by R. E. Col¬ 
lins, 417 
Protozoic rocks, 307 
Prouty, W. F., cited, 365; Telladega 
slates, of Alabama, 363 
Puca sandstone, 241 
QuEnsel, P., cited, 18 
Radisson, P., discovery of Zinc, 340 
Raefler, F., cited, 143 
Rafinesque, C. S., mention, 108, 155 ' 
Ramos series of Bolivia, 372 
Rate of Earth’s rotation, 87 
Rath, G. von, cited, 210 
Rathburn, R., mention, 258 
Raton peneplain, 361 
Raymond, P. E., quoted, 322 
Recency of Andes, by E. W. Berry, 
15 
Recent peat deposits, 139 
Recovery of Low-grade Magnetitic 
Ores in North Carolina, by J. H. 
Pratt, 345 
Red Oak Fault, diagram, 425 
Reid, H. F., quoted, 15 
Return of an American Geologist, 
by C. Keyes, 49 
Reyer, E., cited, 28, 286; mention, 
88 
Ribette, C. A. de la, cited, 370 
Rickard, T. A., cited, 390, 392 
Rightful Demesne of Petrology," by 
C. P. Berkey, 353 
Rio Grande Carbonic Province, by 
C. Keyes, 425 
Road metal, in Wisconsin, 341 
Robertson, J. D., analyses, 287; col¬ 
lections, 35 
Rock densities in laccoliths, 204 
Rock mass-movement, 84 
Rocky Mountains, flexing, 171; 
summit plain, 359; Tertiaries, 70 
Roguewitch, K., cited, 32 
Rotation, Earth’s, rate, 87 
Rothpletz, A., mention, 88 
Rowley, R. R,, Siluric of Missouri, 
131 
Ruedemann, R., quoted, 321 
Safford, j. M., cited, 364 
Sal region, 182 
Salt Lake Cannonball, 75 
San Jorge formation of Argentina, 
21 
San Juan Precordillera, 417 
San Juan natural bridges, 213 
San Luis Potosi, 79 
San Pedro copper deposits; 120 
San Ysidro laccolith, 115 
Sardeson, F. W., Petrifications, 331 
Savage, T. E., cited, 133, 137 
Scarcest crinoids, 76 
Scharf, R. F., cited, 24 
Schoolcraft, H. R., quoted, 253 
Schuchert, C., cited, 137, 180, 183; 
note, 197; quoted, 74; translation, 
177 
Schumacher, H. C., quoted, 83 
Science and State, 164 
Scope of Cretacic Sedimentation in 
Andean Geosyncline, by E. W. 
Berry, 241 
Seasonal changes on Mars, 270 
Secular Changes of Geological Cli¬ 
mate, by M. Manson, 301 
Sederholm, J. J., quoted, 394 
Sedgwick, A., mention, 233 
Sedimentary Nature of Colemanite 
Deposits, by C. Keyes, 399 
Serial Affinities of Siluric Forma¬ 
tions in Northeastern Missouri, 
by C. Keyes, and R. R. Rowley, 
131 
Serlo, B., cited, 383 
Sexton limestone, defined, 134 
Shaler, N. S., mention, 49, 107 
Shattuck, G. B., mention, 44 
Shimek, B., acceptance speech, 238 
Shumard, B. F., cited, 40 
Siebenthal, C. E., cited, 249 
Sierra del Oro, characteristics, 109; 
horst, 112; laccoliths, 29; setting, 
111 
