JOLUME XXXI 



THE 



NUMBER 3 



Journal of Geology 



ifii'^ :'»■ 



A Semi-Quarterly^^^ 



^ APR 2 3 m 



Edited By 

 thomas c. chamberlin 



With the Active Collaboration of 



J? 75 



^JV 



AU W» 



o»^ 



V^*^ 



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 EDITORS 



jjIR ARCfflBALD GEIKIE, Great Britain 

 JZHARLES' BARROIS, France 

 ALBRECHT PENCK, Germany 

 13ANS REUSCH, Norway 

 ijERARD DeGEER, Sweden 

 5IR T. W. EDGEWORTH DAVID, Australia 

 a. ALBERT BROUWER, Holland 

 BAILEY WILLIS, Leland Stanford Junior University 



ARTHUR L, 

 * Deceased 



CHARLES D. WALCOTT, Smithsonian Institution 

 DAVID WHITE, U.S. Geological Survey 

 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 

 DAY, Carnegie Institution 



APRIL-MAY 1923 



;he final consolidation phenomena in the crystallization of 



I IGNEOUS ROCK - R- J- Colony 



I VENERABLE CLIMATIC FALLACY T. C. Chamberlin 



PHE red beds of the FRONT RANGE IN COLORADO: A STUDY IN SEDI- 



^ MENTATION - - - - - A. J. Tieje 



SOSTASY AS A RESULT OF EARTH SHRINKAGE - - Francis Parker Shepard 

 ^HE DEVONIAN LIMESTONE AT ST. GEORGE, QUEBEC - - Thomas H. Clark 

 i)ID CRATER LAKE, OREGON, ORIGINATE BY A VOLCANIC SUBSIDENCE OR AN 

 ; EXPLOSIVE ERUPTION ? - - - - - - - - - - J. S. Diller 



iN IMPROVED RECORDING MICROMETER FOR ROCK ANALYSIS 



Chester K. Wentworth 

 HE PHYSICAL CHEMISTRY OF THE CRYSTALLIZATION AND MAGMATIC DIF- 

 FERENTIATION OF IGNEOUS ROCKS - - J. H. L. Vogt 



REVIEWS - . - - . 



169 

 17.9 



192 

 208 

 217 



226 



228 



233 

 253 



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 



