678 INDEX TO VOLUME XXVII 



PAGE 



Oil and Gas Industry under the Revenue Act of 1918, Manual for the. 

 By the U.S. Bureau of Internal Revenue of the Treasury Depart- 

 ment, 1919. Review 221 



Oregon, The Salient Features of the Geology of. By Warren Dupre 



Smith and Earl L. Packard 79 



Packard, Earl L., Warren Dupre Smith and. The Salient Features of 



• the Geology of Oregon 79 



Paleozoic Section of the Tomah and Sparta Quadrangles, Wisconsin, 



The. By W. H. Twenhofel and F. T. Thwaites .... 614 



Peculiar Belt of Oblique Faulting, A. By RoUin T. Chamberlin . 602 



Pegmatite, Silexite, and Aplite of Northern New York. By William J. 



Miller 28 



Pennsylvania, Some Subordinate Ridges of. By Harry N. Eaton . 121 



Permo-Carboniferous Ammonoids of the Glass Mountains, West Texas, 

 and Their Stratigraphical Significance, The. By Emil Bose. 

 Review by James Perrin Smith 132 



Pjanimeter Method for the Determination of the Percentage Composi- 

 tions of Rocks, A. By Albert Johannsen 276 



Pleistocene Submergence in the Columbia Valley of Oregon and Wash- 

 ington, The Late. By J Harlen Bretz 489 



Pre-Cambrian of Northern Quebec, Some Stratigraphic and Structural 



Features of the. By H. C. Cooke . . . . 65, 180, 263, 367 



Pre-Cambrian Rocks of Southeast Newfoundland. By A. F. Budding- 

 ton 449 



Priiiciples of Economic Geology, The. By W. H. Emmons. Review 



by Adolph Knopf 482 



Principles of Oil Accumulation, Notes on. By Alex. W. McCoy . 252 



Quirke, T. T. The Richardton Meteorite 431 



Recent Publications 63, 138, 222, 303, 485, 581, 673 



Reviews 61, 132, 221, 391, 482 



Richardton Meteorite, The. By T. T. Quirke 431 



Ridges of Pennsylvania, Some Subordinate. By Harry N. Eaton . 121 

 Rigidity of the Earth, The. By A. A. Michelson and H. G. Gale 585 



Rosiwal Method for the Determination of the Minerals in a Rock, On 



the Accuracy of the. By i\lbert Johannsen and E. A. Stephenson 212 



Salt Dome, Freestone County, Texas, The West Point. By E. 



DeGolyer 647 



Schroeder, Rolf A. Curious Erosion Features in West Tennessee Clays 480 



Sedimentation, Inequalities of. By E. M. Kindle 339 



Sellards, E. H. Geology of Florida 286 



Shannon, Earl V. On Coarse Gabbroid Diabase in Westfield, Massa- 

 chusetts 579 



