S^fJLUME XXX 



THE 



NUMBER 5 



Journal of Geology 



A Semi-Quarterly 



IM tun^' 



Edited By 



APR 'd 



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THOMAS C. CHAMBERLIN AND ROLLIN D. SALISBTS^-^r/^ ^# 



With the Active Collaboration of 



STUART WELLER. Invertebrate Paleontology 

 EDSON S. BASTIN, Economic Geology 



ALBERT JOHANNSEN, Petrology 



ROLLIN T. CHAMBERLIN, Dynamic Geology 



ASSOCIATE EDITORS 



fiR ARCHIBALD GEIKIE, Great Britain 

 :HARLES BARROIS, France 

 i.LBRECHT PENCK, Germany 

 IANS REUSCH, Norway 

 lERARD DeGEER, Sweden 

 IR T. W. EDGEWORTH DAVID, Australia 

 AILEY WILLIS, Leland Stanford Junior University 

 'HARLES 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 



JULY-AUGUST 1922 



'OST-GLACIAL LAKES IN THE MACKENZIE RIVER BASIN, NORTH WEST TERRI- 

 TORIES, CANADA - - - - A. E. Cameron 337 



)INOSAUR TRACKS IN HAMILTON COUNTY, TEXAS - - - W. E. Wrather 354 



'ROBLEMS IN STRATIGRAPHY ALONG THE ROCKY MOUNTAIN TRENCH 



Francis Parker Shepard 361 



I SCALE OF GRADE AND CLASS TERMS FOR CLASTIC SEDIMENTS 



Chester K. Wentworth 377 



HE PRE-CAMBRIAN OF WESTERN PATRICIA E. M. Burwash 393 



ETROLOGICAL ABSTRACTS AND REVIEWS - - - - - - - - - 401 



REVIEWS . - - . .411 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO, ILLINOIS, U. S. A. 



THE CAMBRIDGE UNIVERSITY PRESS, London 



THE MARUZEN-KABUSHIKIKAISHA, Tokyo, Osaka, Kyoto, Fukuoka, Sendai 



THE MISSION BOOK COMPANY, Shanghai 



