VOLUME XXVII ' NUMBER q 



THE 



Journal of Geology 



A Semi-Quarterly 



Edited By 

 thomas c. chamberltn and rollin d. salisbury 



With the Active Collaboration of 



STUART WELLER, Invertebrate Paleontology ALBERT JOHANNSEN, Petrology 



ROLLIN T. CHAMBERLIN, Dynamic Geology 



ASSOCIATE EDITORS 



SIR ARCHIBALD GEIKIE, Great Britain JOHN C. BRANNER, Leland Stanford Junior University 



CHARLES BARROIS. France RICHARD A. F. PENROSE, Jr., Philadelphia, Pa. 



ALBRECHT PENCK, Germany WILLIAM H. HOBBS, University of Michigan 



HANS REUSCH, Norway p^^^K D. ADAMS. McGiU University 



GERARD DeGEER, Sweden /-wadt ire ir t ttttu tt • v f w ■ 



T. W. EDGEWORTH DAVID. Australia CHARLES K. LEITH, Umversity of Wisconsm 



BAILEY WILLIS, Leland Stanford Junior University WALLACE W. ATWOOD, Harvard University 



CHARLES D. WALCOTT, Smithsonian Institution WILLIAM H. EMMONS. University of Minnesota 



JOSEPH P. IDDINGS, Washington, D.C. ARTHUR L. DAY, Carnegie Institution 



JULY-AUGUST 1919 



INVESTIGATION VERSUS PROPAGANDISM - - - - ' - T. C. Chamberlin 305 



INEQUALITIES OF SEDIMENTATION - - E.M. Kindle 339 



SOME STRATIGRAPHIC AND STRUCTURAL FEATURES OF THE PRE-CAMBRIAN 



OF NORTHERN QUEBEC. IV - - H. C. Cooke 367 



THE THURMAN-WILSON FAULT THROUGH SOUTHWESTERN IOWA AND ITS 



BEARINGS JohnL. TiLTON 383 



REVIEWS - - 391 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO, ILLINOIS, U.S.A. 



. THE CAMBRIDGE UNIVERSITY PRESS, London and Edinburgh 

 THE MARUZEN-KABUSHIKI-KAISHA, Tokyo, Osaka, Kyoto. Fukuoka, Sendai 

 THE MISSION BOOK COMPANY, Shanghai 



