INDEX TO VOLUME 33 



861 



Page 

 Smith, E. S. C. ; Geology of the Paw- 



tuckaway Mountains 128 



Smith, W. S. T. ; Jasperoid of the Jop- 



]in district, Missouri, Kansas, and 



Oklahoma 147, 189 



Snake River fauna; W. D. Matthew. . . 215 

 Some astronomical tests of the planet- 



esimal hypotheses ; H. F. Reid. . . . 140 



— cavern deposits in the Permian in 



west Texas ; J. A. Udden 153 



— considerations touching on isostasy ; 



H. O. Wood 114, 303 



— etching tests on pyrrhotite ; H. C. 



Boydell 226 



— new aspects of the geology at Co- 



balt ; A. R. Whitman 189 



facts bearing on correlations of 



Chester formations ; E. O. Ulrich . . 805 



— problems connected with the Dakota 



sandstone ; Presidential address by 



T. W. Stanton 203, 255 



— — of mineral genesis in South Af- 



rica ; Presidential address by C. 



Palache 229 



Source of the sulphates in the Salina 



beds ; D. H. Newland 150 



South Dakota, Cummingtonite schists 



of 225 



— , Oreodon beds of the Big Badlands of 155 



— , Hyracodons from 209 



Stages of the Ice Age ; W. Upham . 100, 491 

 Stanton, T. W. ; Some problems con- 

 nected with the Dakota sandstone ; 



Presidential address by 203, 255 



Stock, C. ; Late Tertiary mammalian 

 remains from near Alturas, north- 

 eastern California 188 



— and E. L. Furlong ; Marsupial from 



the John Day Oligocene of Logan 

 Butte, Oregon 189 



Stoller, J. H. ; Late Pleistocene his- 

 tory of the lower Mohawk and mid- 

 dle Hudson region 117, 515 



Stone, R. W. ; Condition of magnesite 



in 1920 226 



Stose, G. W. ; Structure of the pre- 

 Pennsylvanian rocks of the Big- 

 Stone Gap area, Wise County, Vir- 

 ginia 98 



Strata near Stuart, Iowa ; J. L. Tilton 



153, 689 



Stratigraphy of the crystalline schists 

 of Pennsylvania and Maryland ; 



E. B. Knopf and A. I. Jonas 110 



lower Oreodon beds of the 



South Dakota Big Badlands ; W. J. 



Sinclair 155 



Stressing economics in the teaching of 



economic geology; E. S. Bastin... 224 

 Structure of the Connecticut basin 



during the Newark epoch ; W. G. 



Foye 87 



pre-Pennsylvanian rocks of the 



Big Stone Gap area. Wise County, 



Virginia ; G. W. Stose 98 



Structural relation of the Purcell 



Range to the Canadian Rockies ; 



F. P. Shepard 91 



Stuart, Iowa, Strata near 153, 689 



Study of supergene processes at Nei- 



hart, Montana ; M. B. Hurst 226 



Sulphates in the Salina beds, Source 



of the 150 



Supplement to the bibliography and 



catalogue of the fossil vertebrates 



of North America ; O. P. Hay 203 



Supposed labyrinthodont footprints 



from the Maryland Carboniferous ; 



R. L. Lull 211 



Page 

 Surface fusion of lava; J. S. Diller... 142 

 Symposium on isostasy 113 



Talladega phyllite, Age of the 151 



TAONURUS, Nature of 199 



Teaching of Geology, Report of Com- 

 mittee on 55 



Tennessee, Ordovician of 605 



— , Trenton of central 109, 571 



— , Volcanic ash bed in the Ordovician 



of 152 



Tertiary mammalian remains from Al- 

 turas, California 188 



— of California, Marine 18S 



Texas-Kansas sections, Red Beds and 



terrestrial vertebrates of the 671 



— ■ — terrestrial vertebrates 208 



— . Pennsylvanian faunas of 199 



The Andean geosyncline ; C. Schuchert. 90 



— ■ Society of Economic Geologists — its 

 sphere and future ; Presidential 

 address by R. A. F. Penrose, Jr. . . 224 



Theory of isostasy — a geological prob- 

 lem ; W. Bowie 113, 273 



Thom, W. T., Jr. ; Relation of deep- 

 seated faults to surface structure 

 in the region northeast of the Yel- 

 lowstone Park plateau 99 



Thorpe, M. R. ; Arwocyon^ a probable 



old world migrant 214 



— ; Primitive and carnivore-like char- 

 acters of the Merycoidodontidae. . . 212 



— ; Restoration of Eporeodon socialis, 



Marsh 213 



Thrusting, Isostatic compensation as 



cause of 337 



Tillite "at Levis, Quebec 99 



Tilton, J. L. ; Strata near Stuart, Iowa 



153, 689 



Todd, J, E. ; Is the channel of the Mis- 

 souri River through North Dakota 

 of Tertiary origin ? 120 



Tomboloes and points, Formation of. . 122 



Tooth of almost human type from the 

 Lower Pliocene Snake Creek beds 

 of western Nebraska; H. J. Cook. . 214 



Transgressions, regressions, and shore- 

 line displacements during the Pleis- 

 tocene ; C. A. Reeds 140 



Transitional coals and their bearing 

 hypotheses of the origin of coals ; 

 E. C. Jeffrey 148 



Trask, P. D. ; Discussion of the age of 

 the Briones formation of middle 

 California 189 



Treasurer's report 9 



Trenton of central Tennessee and Ken- 

 tucky ; P. E. Raymond 109, 571 



Tridymite-orthoclase rock, a new 

 metamorphic rock type from Im- 

 perial County, California ; A. F. 

 Rogers 129 



Trilobites and cephalopods, Possible 



habits of 197 



— . "Hypoparian" genera of 205 



Trowbridge, A. C, and W. S. Glock ; 

 Quantitative study of the deriva- 

 tion of North American Algonkian 

 sediments 108 



Troxell. E. L. ; Relationship of the 

 Great Basin and Great Plains 

 fauna 210 



— ; Fossils of the Connecticut Valley.. 209 

 Tubular amygdaloid from Nova Scotia ; 



T. L. Walker and A. L. Parsons... 126 

 Two corrections of mineral data ; N. L. 



Bowen 230 



