INDEX TO VOLUME 19 



615 



Page 



Shore debris, Source of 495-496 



Shoreline studies on Lakes Ontario 



and Erie, by Alfred W. G. Wilson. 



471-500 



..Views Illustrating 496 



Shore materials, Distribution of . . . 497-499 



Siberia, Silurian fauna of 276-277 



SiDERiTE, Occurrence at California mine 



of 95, 97 



SiEBENTHAL, C. E., Acknowledgments 



to 405 



— -, Sections of Casper formation made 



by 424,425 



Sifjaretus, Occurrence of 283 



Silica, Crystallization of 127 



Silurian age. Certain Upper Yukon 



rocks proved to be 272-277 



— dolomites. Occurrence of 324 



— faunas. Characteristics of 274 



— - fossils. Porcupine valley. Nomen- 

 clature of 325-326 



— rocks of Upper Yukon, Composition 



of 272 



Silver, Occurrence In California mine 



of 94 



Sioux quartzite. Terms New Ulm and 



Pipestone synonymous with 226 



Slate, Plate showing specimens of.... 104 

 Smyth, C. H., Jr., cited on rocks of 



Alexandria quadrangle 159 



Solar elements. Enumeration of 123 



Soldier ravine. Location of 38 



SoLDV, , cited on derivation of 



helium 114 



SOLLAS, Post-Archean time estimated by 128 

 Some features of the geology of Arizona 



and western New Mexico along the 



Santa Fe railroad. (Read by title.) 539 

 SoxoRA, Carrying capacity of sheet- 

 floods of 202 



— . Flood origin of plain of 73 



South Africa, Dwyka tUllte in 351 



— , Inter^lacial periods In 360 



— , Study of planatlon in 77 



South - Central Wyoming, Geologic 



map of 403 



South Kearsarge mine, analysis of 



waters at 504 



South Omaha, View showing Union 



Pacific "cut-off" at 253 



Southern Michigan, Upper Sllurlc 



fauna from 540-553 



Southwest, Detritus In valleys of... 70-71 

 Spencer, . cited on eolian origin of 



gravel plains 54 



Sphalerite, Occurrence at California 



mine of 95, 97 



Spirifer nohilis. Occurrence In Silurian 



of Upper Yukon of 274 



— , Occurrence of 283 



Spurr, J. E., Investigations In Upper 



Yukon by 257, 259 



Stanley-Brown, .Joseph, elected editor 521 

 Stanton, Dr. T. W., cited on fauna of 



Sacramento valley 387 



fossil shells of Big Bar, Cali- 

 fornia 381 



. fossils of Montana formation.. 402 



Mariposa and Knoxville faunas 399 



— ■ shells in Monte de Oro forma- 



tion 390-391 



— , Fossil shells identified by 378 



— , Fossils of Colorado formation Iden- 

 tified by 458 



the Upper Yukon Mesozolc re- 

 ported on Ijy 306-307 



— quoted on fossils of Rattlesnake 



creek 383 



on Thompson creek 373 



Stars, Development from nebulse of... 124 



Page 

 Stevenson, .T. .T., Memorial of James 



Merrill Safford by 522-527 



Stone, R. W., Investigations In Upper 



Yukon by 258 



Storrs, James, cited on fossils of Elk 



river region 376 



— , Plant collection of 373 



— , Plants In Sacramento valley col- 

 lected by 384 



Strata containing the iurassic flora of 



Oregon, by J. S. Diller 367-402 



Stratigraphy of Tapper Yukon.... 264-263 

 Stream carrying capacity. Comparisons 



of 202 



— conglomerate. Views showing. See 



pi. 9, page 148 



. formation of. See pi. 10, 



page 152 



— work, Opinions of Powell and Gilbert 



on 202, 203 



Streptis oreui. Occurrence in Silurian 



of Upper Yukon of 274 



Strickler, O. C, Acknowledgments to. 222 

 Stromatoporoids, Classification of.... 



547, 548, 551 

 Stropheodonta, Occurrence in Devonian 



rocks of 283 



Structure and stratigraphy of the 



Ouchita Ordoviclan area. Arkansas 



(abstract), by A. H. Purdue 556 



Strutt, R. J., cited on distribution of 



radium : 138-139 



— , Discovery of thorI\im by 117 



■ — , Observations on radioactivity by 136-139 

 — , Radioactivity of sea salt determined 



by 140 



Sudbury, Location of pre-Cambrlan 



series near 6 



Sullivan, Dr E. C, Analysis of White 



creek cement by 150. 151 



Sun, Components of the 123-125 



Sundance formation. Fossils of 442 



, General relations of 438 



, Location of 438-441 



of Jurassic system 438-442 



, Sections of 439-441 



, Views of 440 



— shales. View showing 447 



Swift creek, Conglomerate on 154 



Tacher conglomerates. Similarity of 

 Herat, Afghanistan, conglomerates 



to 350 



Taconic, Meguma series supposed to be 100 

 Tangier-Smith, W. S., Section of Cas- 

 per formation by 428 



Taylor, Frank B., Title of paper by. . . 538 



Tensleep sandstone. Age of 416 



of the Carboniferous system. 415-416 



, Views showing 416 



Terraces, Formation of 153 



— of Saint Anthony fails 42-44 



Tertiary beds. Occurrence In Porcupine 



Valley district of 336-337 



of the Detrltai-Sacramento valley. 71 



, Section below Coleen river of . . . . 336 



— deposits. Occurrence of 67 



of California intermont plains... 69 



— , Occurrence in Upper Yukon rocks 



of 307-309 



— system in central Wyoming 463 



Tpieresa and Pamelia formations. Com- 

 parison of Champlain and Mohawk 

 sections with 171 



• , Unconformity between .... 170 



— dolomite. Character and thickness of 



160, 161 



— formation. Age of 169-170 



, Study of unconformity of rocks 



of 164-166 



