736 INDEX TO VOLUME XXX 



PAGE 



Segregation Granites. By Alfred C. Lane 162 



Shepard, Francis P. Possible Silurian Tillite in Southeastern British 



Columbia 77 



. Problems in Stratigraphy along the Rocky Mountain Trench 361 



— . The Structural Relation of the PurceU Range and the Rocky 



Mountains of Canada 130 



Short-Bellows, Roll-Film Kodak for Detail Work in the Field, Adapting 



a. By Chester K. Wentworth 158 



Smyth, Jr., C. H. Genesis of the Zinc Ores of Edwards District, St. 



Lawrence County, New York. Review by J. F. W 418 



Source Book for the Economic Geography of North America. By 



Charles C. Colby. Review by R. D. S 82 



Springer, Frank. On the Crinoid Genus Scyphocrinus and Its Bulbous 



Root Camarocrinus. Review by A. C. McF 259 



Stone, R. W. Gypsum Deposits of the United States. Review by 



F. P. S 327 



— . Gypsum in 1919. Review by E. S. B 336 



Stratification of the Sediments in the Recent Delta of Eraser River, 



British Columbia, Canada, The Character of the. By W. A. 



Johnston 115 



Stratigraphy along the Rocky Mountain Trench, Problems in. By 



Francis Parker Shepard 361 



Structural Relation of the PurceU Range and the Rocky Mountains of 



Canada, The. By Francis Parker Shepard 130 



Structure in Paleozoic Bituminous Coals. By Reinhardt Thiessen. 



Review by A. C. N 718 



Systematic Report on the Cambrian and Ordovician of Maryland. By 



R. S. Bassler. Review by A. C. McF 176 



Taber, Stephen. The Great Fault Troughs of the Antilles ... 89 

 Thiessen, Reinhardt. Structure in Paleozoic Bituminous Coals. 



Review by A, C. N. . • 718 



Timiskaming County, Quebec. By M. E. Wilson. Review by J. F. W. 413 

 Triassic Trough of Connecticut, Origin of the. By Wilbur G. Foye . 690 

 Trueman, A. E. Aspects of Ontogeny in the Study of Ammonite 



Evolution 140 



Tungsten Deposits in the United States, Contact-Metamorphic. By 



Frank L. Hess and Esper S. Larsen. Review by E. S. B. . . 719 

 Tungsten in 1918. By Frank L. Hess. Review by E. S. B. and 



C. H. B., Jr 423 



United States Geological Survey. World Atlas of Commercial Geology; 

 Part I, Distribution of Mineral Production. Review by Harlan 

 H. Barrows 650 



