VOLUME XXX 



NUMBER 3 



THE 



Journal of Geology 



A Semi-Quarterly 



APR 2 3 193: 

 Edited By 



thomas c. chamberlin and rollin d. salisbubj^^^ wio»^"^ 



With the Active Collaboration of 



STUART WELLER, Invertebrate Paleontology 

 EDSON S. BASTIN, Economic Geology 



ALBERT JOHANNSEN, Petrology 



ROLLIN T. CHAMBERLIN, Dynamic Geology 



ASSOCIATE EDITORS 



SIR ARCHIBALD GEIKJE, Great Britain 

 CHARLES BARROIS, France 

 ALBRECHT PENCK, Germany 

 .HANS REUSCH, Norway 

 GERARD DeGEER, Sweden 

 SIR T. W. EDGEWORTH DAVID, Australia 

 BAILEY WILLIS, Leland Stanford Junior University 

 CHARLES D. WALCOTT, Smithsonian Institution 



JOHN C. BRANNER, Leland Stanford Junior University 

 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 

 ARTHUR L. DAY, Carnegie Institution 



APRIL-MAY 1922 



THE REACTION PRINCIPLE IN PETROGENESIS 



N. L. Bowen 177 



AN OUTLINE OF THE PHYSIOGRAPHIC HISTORY OF NORTHEASTERN ONTARIO 



W. H. Collins 



199 



Austin F. Rogers 211 



- John S. Brown 217 



A NTiW OCCURRENCE OF CRISTOBALITE IN CALIFORNIA 



FAULT FEATURES OF SALTON BASIN, CALIFORNIA 



MARINP UPPER CRETACEOUS AND A NEW ECHINOCORYS FROM THE ALTA- 



PLANICIE OF BOLIVIA - - ... - - - Edward W. Berry 227 



FORMER COURSES OF THE ANDROSCOGGIN RIVER - - Irving B. Crosby 232 



NOTES ON THE SAND DUNES OF NORTHWESTERN INDIANA George B. Cressey 248 



PETROLOGICAL ABSTRACTS AND REVIEWS - - - - - - - - 252 



REVIEWS - ^ -..----.------ 257 



THE UNIVERSITY OF CHICAGO 



CHICAGO, ILLINOIS, U. S. A. 



PRESS 



THE CAMBRIDGE UNIVERSITY PRESS, London 



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



THE MISSION BOOK COMPANY, Shanghai 



