/OLUMEXXXI NUMBER 7 



THE 



Journal of Geology 



A Semi-Quarterly 



Edited By 

 thomas c. chamberlin 



With the Active Collaboration of 



ROLLIN T. CHAMBERLIN, Managing Editor 

 Dynamic Geology 

 STUART WELLER, Invertebrate Paleontology , ALBERT JOHANNSEN Petrology 



EDSON S. BASTIN, Economic Geology J HARLEN BRETZ. Stratigraphic Geology 



ASSOCIATE EDITORg 



SIR ARCHIBALD GEIKIE, Great Britain CHARLES D. WALCOTT, Smithsonian Institution 



[ CHARLES BARROIS, France DAVID WHITE, U.S. Geological Survey 



ALBRECHT PENCK. Germany RICHARD A. F. PENROSE Jr., Philadelphia, Pa. 



*HANS REUSCH, Norway WILLIAM H. HOBBS, University of Michigan 



GERARD DeGEER, Sweden FRANK D. ADAMS, McGill University 



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



H ALBERT BROUWER, Holland WALLACE W. ATWOOD Clark University 



BAILEY WILLIS, Leland Stanford Junior University WILLIAM H. EMMONS, University of MinnesoU 



ARTHUR L. DAY, Carnegie Institution 

 * Deceased 



OCTOBER-NOVEMBER 1923 



THE PAT EOZOIC ROCKS FOUND IN DEEP WELLS IN WISCONSIN AND NORTHERN 



ILLINOIS ------------ F.T.Thwaites 529 



THE STRUCTURAL GEOLOGY OF BRITISH MALAYA - - - J. B. Scrivenor 556 



THE FERRUGINOUS CHERT FORMATIONS OF NOTRE DAME BAY, NEWFOUND- 

 LAND ------------' Edward Sampson 571 



TO QUESTION THE THEORY OF PERIODIC DIASTROPHISM Francis Parker Shepard 599 

 REVIEWS - ■ ^'4 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO, ILLINOIS, U.S.A 



THE CAMBRIDGE UNIVERSITY PRESS, London 



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



THE MISSION BOOK COMPANY, Shanghai 



