INDEX TO VOLUME XXIII 799 



PAGE 



Powell, S. L. Discovery of the Normanskill Graptolite Fauna in the 



Athens Shale of Southwestern Virginia 272 



Powers, Sidney. The Origin of the Inclusions in Dikes . .1, 166 



Pre-Cambrian Classification in Ontario, Revision of. By Willet G. 



Miller and Cyril W. Knight 585 



Pre-Cambrian Literature of North America, Summaries of, for 1909, 

 1910, 191 1, and Part of 191 2. By Edward Steidtmann 



81,183,261,461,575 



Pre-Keweenawan Formations of the Eastern Gogebic Iron Range of 

 Michigan, A Revision of the Sequence and Structure of the. By 

 R. C. Allen and L. P. Barrett . .689 



Pressure as a Factor in the Formation of Rocks and Minerals. By 



John Johnston 730 



Prince George's County, Maryland Geological Survey. By William 



Bullock Clark. Review by T. T. Q 382 



Prindle, L. M. A Geological Reconnaissance of the Fairbanks Quad- 

 rangle, Alaska. Review by V. 0. T 479 



Prosser, Charles S. The Middle and Upper Devonian of the Romney, 



West Virginia, Region 11 



Recent Publications 683, 786 



Reid, Harry Fielding. Variations of Glaciers. XIX .... 548 



Reviews 92,189,282,379,477,785 



Rich, John Lyon, and Edwin A. Filmer. The Interglacial Gorges of 



Six Mile Creek at Ithaca, New York 59 



Robinson, W. I., and E. C. Case. The Geology of Limestone Moun- 

 tain and Sherman Hill in Houghton County, Michigan . . . 256 



Salisbury, R. D. Review of Oklahoma Geological Survey, Bulletin 



13, by Frank Bultram 380 



. Review of Oklahoma Geological Survey Bulletin 22. By C. W. 



Shannon 380 



Sanford, Samuel, and Ralph W. Stone. Useful Minerals of the United 



States. Review by A. D. B. 287 



Savage, T. E. Stratigraphy and Paleontology of the Alexandrian 



Series in Illinois and Missouri. Part I. Review by T. T. Q. . 381 



Shannon, C. W. Oklahoma Geological Survey Bulletin 22. Part I, 

 "Director's Biennial Report"; Part II, "Mineral Resources of 

 Oklahoma and Statistics of Production from 1901 to 1914." Re- 

 view by R. D. S 380 



Shufeldt, R. W. A Critical Study of the Fossil Bird Gallinuloides 



wyomingensis Eastman . 619 



Sinnott, Edmund W., and Irving W. Bailey. The Evolution of Herba- 

 ceous Plants and Its Bearing on Certain Problems of Geology and 

 Climatology 289 



Slide Rule, Use of the, in the Computation of Rock Analyses. By 



James H. Hance 560 



Smith, G. O. Our Mineral Reserves. Review by A. D. B. . . . 383 



Smith, Philip S. The Noatak-Kobuk Region, Alaska. Review by 



V. O. T 478 



