VOLUME XXVll NUMBER 8 



THE 



Journal of Geology 



A Semi-Quarterly 



Edited By 

 thomas c. chamberlin 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 OEIKIE, 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^^j^g. ^ ^DAMS, McGiU University 



GERARD DeGEER, Sweden /-tiadt 17C i^ t r-r-r'Ti tt • -. r «r 



T. W. EDGEWORTH DAVID, AustraUa CHARLES K. LEITH, University of Wisconsin 



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 



NOVEMBER-DECEMBER 1919 



THE RIGIDITY OF THE EARTH - - - - A. A. Michelson and Henry G. Gale 585 



A PECULIAR BELT OF OBLIQUE FAULTING ... - Rollin T. Chambeelin 602 



THE PALEOZOIC SECTION OF THE TOMAH AND SPARTA QUADRANGLES, 



WISCONSIN W. H. Twenhofel and F. T. Thwaites 614 



THE HORIZON OF THE MARINE JURASSIC OF UTAH - - - - C. L. Dake 634 



THE WEST POINT, TEXAS, SALT DOME, FREESTONE COUNTY - - E. DeGolyee 647 



EDITORIAL ...--.-,... 664 



RECENT PUBLICATIONS - - - 673 



INDEX - ' 675, 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO, ILLINOIS, U.S.A. 



THE CAMBRIDGE UNIVERSITY PRESS, London 



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



THE MISSION BOOK COMPANY, Shanghai 



