Contents of Volume XXIII 



NUMBER I 



PAGE 



The Origin or the Inclusions in Dikes. Sidney Powers ... i 



The Meddle and Upper Devonian op the Romney, West Virginia, 



Region. Charles S. Prosser ii 



The Strength of the Earth's Crust. VII. Variations op 

 Strength with Depth as Shown by the Nature op Depar- 

 tures prom Isostasy (Section B). Joseph Barrell . ... 27 



Some Ellipsoidal Lavas on Prince William Sound, Alaska. S. R. 



Capps 45 



A Sketch op the Later Tertiary History op the Upper Missouri 



River. Clyde Maxwell Bauer 52 



The Interglacial Gorges op Six Mile Creek at Ithaca, New 



York. John Lyon Rich and Edwin A. Fihner .... 59 



Summaries of Pre-Cambrian Literature op North America for 



1909, 1910, 1911, and Part op 1912. Edward Steidtmann . . 81 



Reviews 92 



NUMBER II 



Post-Cretaceous History of the Mountains of Central Western 



Wyoming. Part I. Eliot Blackwelder 97 



The Cant well Formation: A Continental Deposit op Tertiary 



Age in the Alaska Range. Joseph E. Pogue 118 



The Phytosauria of the Trias. Maurice G. Mehl .... 129 



The Origin OP THE Inclusions in Dikes (Co»c/M</e(^). Sidney Powers 166 

 Summaries op Pre-Cambrian Literature op North America for 



1909, 1910, 1911, AND Part of 1912. II. Edward Steidtmann . 183 



Reviews 180 



NUMBER III 



Post-Cretaceous History of the Mountains of Central Western 



Wyoming. Part II. Eliot Blackwelder 193 



The Mode op Origin OF Coal. Edward C. Jeffrey . . . . 218 



