MH 



THE 



JOURNAL OF GEOLOGY 



A Semi-Quarterly Magazine of Geology and 

 Related Sciences 



EDITORS 



Thomas C. Chamberlin, in Getieral Charge; Rollin D. Salisbury, Geographic Geology; 

 Samuel W. Williston, Vertebrate Paleontology; Stuart Weller, Invertebrate Paleontology; 

 Albert Johannsen, Petrology; Rollin T. Chamberlin, Dynamic Geology. 



ASSOCIATE EDITORS 

 Sir Archibald Geikie, Great Britain; *Heinrich Rosenbusch, Germany; *Theodor N. 

 TscHERNYSCHEw, Russia; Charles Barrois, France; Albrecht Penck, Germany; Hans 

 Reusch, Nor-way; Gerard DeGeer, Sweden; Orville A. Derby, Brazil; T. W. Edgeworth 

 Umit), Australia; Bailkv Ww^i.is, A rgeritine Republic; Grove K.Gilbert, IVashifZgton, D.C.; 

 Charles D. Walcott, Smithsonian Institniion; Henry S. Williams, Cornell University; Joskph 

 P. Iddings, Washington, D.C.; John C. Branner, Leland Stanford Junior University; 

 Richard A. F. Penrose, Jr., Philadelphia, Pa.; William B. Clark, Johns Hopkitis University; 

 William H. Hobbs, University of Michigan; Frank D, Adams, McGill University; Charles 

 K, Leith, University of Wisconsin; Wallace W. Atwood, Harvard University; William H. 

 Emmons, University of Minnesota. 



* Deceased. 



VOLUME XXII 



JANUARY-DECEMBER, 1914 



THE UNIVERSITY OF CHICAGO PRESS 

 CHICAGO, ILLINOIS 



