338 



INDEX. 



Plains of Guatemala, 211, 222 



subaerial deposition, 16 f. 

 Planetesimal theory, 265 

 Plateau of Guatemala, 218 

 Plateaus of Arizona and New Mexico, 15 ff. 

 Pleistocene: 



Glaciation in, 266, 284 



contrasted with Permian, 234 

 Interglacial warm climates in, 266, 285 

 Pleions, 137, 244 ff. 

 Pliocene, Africa an asylum in, 288 



elevation of mountains in, 284 

 Pliotherm periods, 288 

 Pocy, cited, 237 



"Point of the Tucson Mountains," 53, 55 ff. 

 Polar regions, atmospheric pressure of, 206 

 Pompeckj, on Triassic ammonites, 280 

 Population : 



Ancient density of, 82 



Density of, among Hohokam, 61 



in Pajaritan Plateau, 84 

 ruins, 52 ff. 

 Distribution in Guatemala, 211, 212 

 Former density of, in northwestern New Mexico, 

 77 ff. 

 Populist party and rainfall, 89 

 Port Lobos, ancient graves, 65 

 Portersville, rainfall of, 157 f. 

 Potomac formations, 282 

 Pottery: 



Abundance of, at Jaynes, 52 



in Arizona ruins, 47 

 In Plain of Mexico City, 97 ff. 



terraces, 24 

 Relation to terraces, 43 f. 

 Two types in Pajaritan Plateau, 84 f. 

 Pottery, unusual type at Nelson's Ranch, 58 

 Processional theory of glaciation, 234 

 Precipitation (see Rainfall). 



Pre-Devonic, glacial deposits in Africa, 286, 287, 290, 291 

 Prescott, cited, 96, 97 

 Prescott, Ariz., tree measurements at, 112 ff. 



trees at, 105 f. 

 Pretoria series, 271 



Prices of wheat in England compared with sun-spots, 239 ff . 

 Progreso, rainfall at, 177 



vegetation at, 178 

 Proterozoic cycles of sedimentation in, 275 

 glaciation, 256 ff. 



Earnest in, 272, 285, 286, 295, 296 

 In Canada, 272, 273, 295, 296 

 China, 271, 272, 293, 294, 295 

 Norway, 270, 271, 292, 293 

 Latest in, 269, 270, 271, 285, 291, 292, 293 

 Undated, 271, 272, 286, 293, 294, 295 

 life of, 275 

 limestones of, 275 



possible warmer interglacial chmates In, 270, 

 285 

 Provo River, terraces of, 26 

 Pueblo Alto, ruins of, 80 

 Viejo, ruins of, 77 

 Bonita, double occupation of, 82 



ruins of, 79 

 del Arroyo, 82 

 Indians, 75. (See Indians.) 



Prosperity at coming of Spaniards, 138 

 RebeUion of 1680 A.D., 86 

 Relation to ancient inliabitants, 85 

 changes of climate, 138 

 Pulsations of climate, 117 ff. 

 "Pulse of Asia, The," 90, 156 

 Pyrenees Mountains, 284 

 Pyrheliometer, measurements with, 251 



Quiche, rmns, 218 



Quijotoa Mountains, 62 

 Quirigua, location of, 217 



ruins, 215, 229 



terraces at, 213 



Rainfall: 



Agreement with tree growth, 106 



And tree growth, effect of seasonal distribution, 164 



Amount required for agriculture in Arizona, 54 f. 



At Prescott, 108 



Effect of season of, upon tree growth, 132 



Compared with sun-spots, 119 f. 



Cyclonic vs. monsoon types, 137 



Effect of excessive, upon tree growth, 167 

 on civilization, 219 

 upon density of population in tropica, 189 f. 



Estimation of, by the growth of trees, 101 ff. 



In England compared with California, 241 

 Sierras compared with Arizona, 167 

 Yucatan, 177 



Local variations in northern Arizona, 102 



"Made-up records," 159 



Method of calculating aimual, 110 



Monthly distribution in California, 159 ff. 



Of Arizona and New Mexico, 10, 11 

 California, 157 ff. 

 past, numerical relation to present, 167 



Opposed phases in Idaho and New Mexico, 130 f. 



Records in Arizona, 103 



Relation to European emigration, 89 

 Populist party, 89 



Seasonal distribution and thickness of tree rings, 1 1 1 ff 



Winter vs. summer, 11-13 

 Racial affinities of ancient Americans, 85 

 Rains (see Monsoon rains), 

 Recknagel, N. B., cited, 128 f. 

 Red color in sediments as evidence of climate, 273, 274 



fir, curve of growth, 133 



deposits, significance of, 256 



sediments and arid climates, 286 



geologic distribution of, 273 



spruce, curve of growth, 133 

 Redwood (see Sequoia). 

 Reef corals, Cretacic, 282, 283 



Devonic, 277 

 Reef limestones, 275, 276, 277, 280 

 Religious edifices, 58 



Of Hohokam, 47, 53 

 Religious structures, 56, 59, 61, 68, 83 



In Yucatan, 183, 186 

 Reservoirs at Gran Quivira, 86 



Indian, 62 

 Retalhuleu, 218 



Rhone Glacier, effect of 11-year cycle on, 242 

 Rich, J. L., cited, 26 

 Rillito, deposition at, 34 

 ruins, 52 

 terraces of, 25 

 Rincon VaUey, ruins in, 60 

 Rings of tree growth, 101 



Conditions favoring, 102 f. 



Cross-identification of, 105 f. 



Difficulties of measurement, 143 



Doubled, 110 ff. 



DoubUng of, 105 



Dropping of, 143 



Method of dating, 105 



Nature of, 103 



Thickness according to the points of compass, 104 



Time of formation, 110 



Yearly identification of, 107 f. 

 Rio Grande, terraces of, 26 

 Riordan, T. A., 103 

 Rivers, variable loads of, 32 

 Robbins, W. W., cited, 90 

 Rocky Mountains, 284 



