|0LUME XXX! 



NUMBER 6 



THE 



Journal of Geology 



A Semi-Quarterly 



Edited By 

 thomas c. chamberlin 



With the Active Collaboration of 



ROLLIN T. CHAMBERLIN, Managing Editor 

 Dynamic Geology 

 STUART WELLER, Invertebrate Paleontology ALBERT JOHANNSEN, Petrology • 



EDSON S. BASTIN, Economic Geology J HARLEN BRETZ. Stratigraphic Geology 



ASSOCIATE EDITORS 



ti SIR ARCHIBALD GEIKIE, Great Britain 

 1 CHARLES BARROIS, France 

 ALBRECHT PENCK, Germany 

 *aANS REUSCH, Norway 

 ii GERARD DeGEER, Sweden 

 f' SIR T. W. EDGEWORTH DAVID, Australia 

 i H. ALBERT BROUWER, Holland 

 t BAILEY WILLIS, Leland Stanford Junior University 



ARTHUR L. DAY, Carnegie 

 * Deceased 



CHARLES D. WALCOTT, Smithsonian Institution 

 DAVID WHITE, U.S. Geological Survey 

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

 WILLIAM H. HOBBS, University of Michigan 

 FRANK D. ADAMS, McGill University 

 CHARLES K. LEITH, University of Wisconsin 

 WALLACE W. ATWOOD. Clark University 

 WILLIAM H. EMMONS, University of Minnesota 

 Institution 



SEPTEMBER-OCTOBER 1923 



SUMMARY OF THE GEOLOGY OF THE BEARTOOTH MOUNTAINS, MONTANA 



Arthur Bevan 441 



THERE PENNSYLVANIAN-PERMIAN GLACIATION IN THE ARBUCKLE AND 

 ^WICHITA MOUNTAINS OF OKLAHOMA? Samuel Weidman 466 



IE EXPERIMENTS IN FOLDING 

 llEWS - - - - - - 



R. T. CHAMBERLIN AND F. P. ShEPARD 49O 

 513 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO, ILLINOIS, U.S.A. 



THE CAMBRIDGE UNIVERSITY PRESS, London 



THE MARUZEN-KABUSHIKI-KAISHA, Tokyo, Osaka, Kyoto, Fukuoko, Sendai 



THE MISSION BOOK COMPANY, Shanghai 



