I'OLUME XXV 111, 



NUMBER 4 



THE 



Journal of Geology 



A Semi-Quarterly 



Edited By 

 thomas c. chamberlin and rollin d/s 



With the Active Collaboration of 



STUART WELLER. Invertebrate Paleontology ^ ALBERT JOHANNSENr 



ROLLIN T. CHAMBERLIN, Dynamic Geology 



ASSOCIATE EDITORS 



IR ARCHIBALD GEIKIE, Great Britain 



?HARLES BARROIS, France 



VLBRECHT PENCK, Germany 



JANS REUSCH, Norway 



5ERARD DeGEER, Sweden 



r. W. EDGEWORTH DAVID, Australia 



BAILEY WILLIS, Leland Stanford Junior University 



:HARLES D. WALCOTT, Smithsonian Institution 



OSEPH P. IDDINGS, Washington, D.C. 



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, Harvard University 

 WILLIAM H. EMMONS, University of Minnesota 

 ARTHUR L. DAY, Carnegie Institution 



MAY-JUNE 1920 



THE CHESTER SERIES IN ILLINOIS Sxuart Weller 281 



A CORRELATION OF THE PRE- CAM BRIAN FORMATIONS OF 



NORTHERN ONTARIO AND QUEBEC ------ H.C.Cooke 304 



THE JUAN DE FUCA LOBE OF CORDILLERAN ICE SHEET - - J Harlen Bretz 333 



"SLIDES" IN THE CONEMAUGH FORMATION Earl R. Scheffel 340 



A REPLACEMENT OF WOOD BY DOLOMITE - S. F. Adams 356 



A DISCUSSION OF "NOTES ON PRINCIPLES OF OIL ACCUMU- 

 LATION" BY A. W. McCOY Chester W. Washburne 366 



REPLY TO DISCUSSION BY C. W. WASHBURNE ON "NOTES 



ON PRINCIPLES OF OIL ACCUMULATION" - - . . A. W. McCoy 371 



RECENT PUBLICATIONS -.--.- 3^^ 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO, ILLINOIS, U.S.A. 



THE CAMBRIDGE UNIVERSITY PRESS. London 



THE MARUZEN-KABUSHIKI-KAISHA, Tokyo, Osaka, Kyoto, Fdkuoka, Sbndai 



THE MISSION BOOK COMPANY, Shanghai 



