INDEX TO VOLUME XXX 735 



PAGE 



Problems in Stratigraphy along the Rocky Mountain Trench. By 



Francis Parker Shepard 361 



Proceedings of the Coal Mining Institute of America. Review by 



E. S. B . . . . . . . . 411 



Purcell Range and the Rocky Mountains of Canada, The Structural 



Relation of the. By Francis Parker Shepard 130 



Ransome, Frederick Leslie. The Copper Deposits of Ray and Miami, 



Arizona. Review by E. S. B. and C. H. B 325 



Reaction Principle in Petrogenesis, The. By N. L. Bowen . . . 177 

 Reger, David B. Detailed Report on Nicholas County [West Virginia.] 



Author's Abstract 419 



Report on Mining Operations in the Province of Quebec, 1919. Review 



byE. S.B 335 



Report on Some Sources of HeHum in the British Empire. By J. C. 



McLennan and Associates. Review by E. S. B 411 



Reviews 82,175,257,325,411,501,646,717 



Rocky Mountain Trench, Problems in Stratigraphy along the. By 



Francis Parker Shepard 361 



Rogers, Austin F. A New Occurrence of Crystobalite in California . 211 

 Rogers, G. Sherburne. Helium-Bearing Natural Gas. Review by 



E. S. Bastin 509 



RoUin D. Salisbury— Memorial Editorial. By T. C. C 480 



Ruedemann, Rudolf. On the Occurrence of an Apus in the Permian of 



Oklahoma 311 



St. Peter Sandstone, The Problem of the. By Charles Laurence Dake. 



Review by R. D. S 646 



Salisbury, RoUin D.— Memorial Editorial. By T. C. C 480 



. Review of Source Book for the Economic Geography of North 



America. By Charles C. Colby 82 



-. . Review of the Problem of the St. Peter Sandstone. By Charles 



Laurence Dake 646 



. Review of the White River Badlands. By Cleophus C. 



O'Harra 33'^ 



Sand Dunes of Northwestern Indiana, Notes on the. By George B. 



Cressey 248 



Scale of Grade and Class Terms for Clastic Sediments, A. By Chester 



K. Wentworth 377 



Sears, Julian D. Deposits of Manganese Ore in Costa Rica and Panama. 



Review by C. H. B., Jr 653 



Sediments in the Recent Delta of Eraser River, British Columbia, 



Canada, The Character of the Stratification of the. By W. A. 



Johnston iiS 



