VOLUME XXI 1 1 



THE 



NUMBER 2 



Journal of Geology 



A Semi-Quarterly 



Edited By 

 thomas c. chamberlin and rollin d. salisbury 



With the Active Collaboration of 



SAMUEL W. WILLISTON 



Vertebrate Paleontology 

 STUART WELLER 



Invertebrate Paleontology 



ALBERT JOHANNSEN 



Petrology 

 ROLLIN T. CHAMBERLIN 



Dynamic Geology 



ASSOCIATE EDITORS 



SIR ARCHIBALD GEIKIE, Great Britain 



CHARLES BARROIS, France 



ALBRECHT PENCK, Germany 



HANS REUSCH, Norway 



GERARD DeGEER, Sweden 



ORVILLE A. DERBY, Brazil 



T. W, EDGEWORTH DAVID, Australia 



BAILEY WILLIS, Argentine Republic 



GROVE K. GILBERT, Washington, D.C. 



CHARLES D. WALCOTT, Smithsonian Institution 



HENRY S. WILLIAMS, Cornell University 

 JOSEPH P. IDDINGS, Washington, D.C. 

 JOHN C. BRANNER, Leland Stanford Junior University 

 RICHARD A. F. PENROSE. Jr., Philadelphia, Pa 

 WILLIAM B. CLARK, Johns Hopkins 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, 



FEBRUARY-MARCH 191c . .„ 



POST-CRETACEOUS HISTORY OF THE MOUNTAINS OF CENTRAL WESTERN 

 ' WYOMING. PART I - - - - - - - Eliot Blackwelder 97 



THE CANTWELL FORMATION: A CONTINENTAL DEPOSIT OF TERTIARY AGE IN 



THE ALASKA RANGE _ . .. _ Joseph E. Pogue 118 



THE PHYTOSAURIA OF THE TRIAS Maurice G. Mehl 129 



THE ORIGIN OF THE INCLUSIONS IN DIKES {Concluded) - - Sidney Powers 166 



SUMMARIES OF PRE-CAMBRIAN LITERATURE OF NORTH AMERICA FOR 1909, 



1910, 1911, AND PART OF 1912. II - - - - - Edward Steidtmann 183 



REVIEWS ------- i8q 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO, ILLINOIS, U.S.A. 



Agents 



THE CAMBRIDGE UNIVERSITY PRESS, London and Edinburgh 



KARL W. HIERSEMANN, Leipzig 



THE MARUZEN-KABUSHIKI-KAISHA, Tokyo, Osaka, Kvoto 



