SORBY SPENCER 273 



Page 



SoRBY, H. C, cited on classiflealion of sand grains 21, 62(5, 637 



■ exporiinental geology 29, 175 



metam(>r[)liism 28, 379 



origin of oolites 25, 750 



sand derived from wave action 21, 044 



grains from the new I'ed sandstone of Penrith, England... . 21, C4'J 



strnclnre and origin of noncalcirecms stratified rocks.... 21,628,632 



^-, Reference to work of 28, 736 



SosMAN, R. B., cited on igneous rocks 28, 273 



— , Refei'once to work of 29, 186 



— and Day, A. L., Reference to their work on high temperature 21, 145 



• HosTETTER, ,7. (\ '. Ferrous iron content and magnetic properties of 



the natural oxides of'iroJi as an index to their origin and history 27,60 

 SouLE, Frank, and Humphrey, R. L.. cited on San Francisco earthquake 



and fire of 1906 21, 405 



Sources and tendencies in American geology ; J. Barrell 30, 77 



South America, Age of certain plant-bearing beds in 29, 637 



• — ■ — plant-bearing beds and associated marine formations in. . . . 30, 153 



, Bibliography of the geological and geographical literature of the 



Andean Republic of 24, 75 



, Fresh-water fish faunas of 29, 138 



, Mesozoic floras of 29, 129. 607 



■ — reptiles of 29, 138 



, Paleozoic floras of 29, 129 



, Petroleum supply of 28, 611 



, Tertiary and Pleistocene formations of Peru 29, 165 



crustal movements in 21, 215 



South American mammals ; W. B. Scott 23, 85 



South Carolina, Creation of Geological Survey of 25, 160 



, Distribution of allanite in 28, 477 



, Geological work in 25, 168 



mastodon ; F. B. Loomis 28, 210 



South Dakota, Lance formation of 25, 348 



, Long-jawed mastodon skeleton from 29, 133 



, Natural bridge at Buffalo Gap 21, 320 



— in Bad Lands 21,315 



Big Bad Lands 21,325,326 



, Pleistocene of Sioux Falls and vicinity 23, 125-154 



— • — , Precambrian structure of Black Hills 27, 106 



Southern Illinois, Characteristics of upper part of till of 29, 76 



— Ontario, Deformation of unconsolidated beds in 28, 163 



Spallanzani, L., cited on Stromboli 28, 265 



Sparnacian and Ypresian equivalent to Wasatch 25, 396 



Species, Intracolonial acceleration and retardation and its bearing on ; 



Amadeus W. Grabau 21, 76 



Specific weight of drill cores ; Alfred C. Lane 27, 49 



Speculative nature of geology ; W. M. Davis 24, 70, 687 



Spencer, A. C, cited on glaciation in Alaska 21, 725 



XVIII — Bdll. Geoi.. Soc. Am. 



