VOLUME XXI II 



THE 



NUMBER 8 



Journal of Geology 



A Semi-Quarterly 



Edited By 



thomas c. chamberlin and rollin d. salisbury 



With the Active Collaboration of 



SAMUEL W. WILLISTON 



Vertebrate Paleontology 

 STUART WELLER 



Invertebrate Paleontology 



ALBERT JOHANNSEN 



Petrology 

 ROLLIN T. CHAMBERLIN 



Dynamic Geology 



ASSOCIATE EDITORS 



SIR ARCHIBALD GEIKIE, Great Britain 



CHARLES BARROIS, France 



ALBRECHT PENCK, Germany 



HANS REUSCH, Norway 



GERARD DeGEER, Sweden 



ORVILLE A. DERBY, Brazil 



T, W. EDGEWORTH DAVID, Australia 



BAILEY WILLIS, Argentina 



GROVE K. GILBERT, Washington, D.C. 



CHARLES D. WALCOTT, Smithsonian Institution 



HENRY S. WILLIAMS, Cornell University 

 JOSEPH P. IDDINGS, Washington, D.C. 

 JOHN C. BRANNER, Leland Stanford Junior University 

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

 WILLIAM B. CLARK, Johns Hopkins University 

 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 



NOVEMBER-DECEMBER 191 j 



A REVISION OF THE SEQUENCE AND STRUCTURE OF THE PRE-KEWEENAWAN 

 FORMATIONS OF THE EASTERN GOGEBIC IRON RANGE OF MICHIGAN 



R. C. Allen and L. P. Bareett 689 



DISCUSSION OF CORRELATION - - - - - C. K. Leith and R. C. Allen 703 



PRESSURE AS A FACTOR IN THE FORMATION OF ROCKS AND MINERALS 



John Johnston 730 



TWO GLACIAL STAGES IN ALASKA ------- Stephen R. Capps 748 



STRATIGRAPHY OF THE WAVERLY FORMATIONS OF CENTRAL AND SOUTHERN 



OHIO {Continued). ■ PART II ------- - Jesse E. Hyde 757 



REVISION OF THE MAP OF LAKE AGASSIZ ----- Warren Upham 780 



REVIEWS - - -.------. 785 



RECENT PUBLICATIONS ....--------- 786 



INDEX TO VOLUME XXIII -------- 793 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO, ILLINOIS, U.S.A. , 



Agents 



THE CAMBRIDGE UNIVERSITY PRESS, London and Edinboegh 



KARL W. HIERSEMANN, Leipzig 



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



