VOLUME XXXI 



THE 



NUMBER 2 



Journal of Geology 



A SEMI-QUARTERL^;:?^^*^ ^''^^^^f^. 



Edited By 

 thomas c. chamberl 



With the Active Collaboration of 



ROLLIN T. CHAMBERLIN, Managing Editor 

 Dynamic Geology 

 STUART WELLER, Invertebrate Paleontology ALBERT JOHANNSEN, Petrology 



EDSON S. BASTm,.Ecojiomic Geology J. HARLEN BRETZ, Stratigraphic Geology 



^ f 



ASSOCIATE EDITORS 



SIR ARCHIBALD GEIKIE, Great Britain 



CHARLES BARROIS, France 



ALBRECHT PENCE, Germany 



HANS REUSCH, Norway 



GERARD DeGEER, Sweden 



SIR T. W. EDGEWORTH DAVID, Australia 



H. ALBERT BROUWER, Holland 



BAILEY WILLIS, Leland Stanford Junior University 



CHARLES D. WALCOTT, Smithsonian Institution 

 DAVID WHITE, U.S. Geological Survey 

 RICHARD A. F. PENROSE, Jr., PhUadelphia, 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 



FEBRUARY-MARCH 1923 



THE PROBLEM OF THE ANORTHOSITES AND OTHER MONOMINER.\L IGNEOUS 



ROCKS - - - - - - - - -.- - -F. Loewinson-Lessing ' 89 



THE GROWTH OF STALAGMITES AND. STALACTITES - - Vernon C. Allison 106 



THE PHYSIOGRAPHIC DEVELOPMENT OF THE BIG THOMPSON RIVER VALLEY 



IN COLORADO -- Margaret Bradley Fxtller 126 



NOTES ON MUD CRACK AND RIPPLE MARK IN RECENT CALCAREOUS SEDI- 

 MENTS - - - - - - - - - - - - - - E. M. Kindle 138 



ALGAE, BELIEVED TO BE ARCHEAN - John W. Grtjner 146 



AN ASSOCIATION OF KAOLINITE WITH MIAROLITIC STRUCTURE A. F. Bltjdington 149 



EDITORIAL - - - - 152 



REVIEWS IS4 



THE UNIVERSITY OF CHICAGO PRESS 



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