VOLUME XXIV 



THE 



NUMBER 2 



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 WELLE R 



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 



T. W. EDGEWORTH DAVID, Australia 



BAILEY WILLIS, Leland Stanford Junior University 



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 



FEBRUARY-MARCH 1916 



THE ACADIAN TRIASSIC. PART II - - - - - - - Sidney Powers 



NOTES ON RIPPLE MARKS - . , - - - - - - - - J. A. Udden 



PYROPHYLLITIZATION, PINITIZATION, AND SILICIFICATION OF ROCKS AROUND 

 CONCEPTION BAY, NEWFOUNDLAND - - - - - A. F. Buddington 



THE ORIGIN OF RED BEDS. A STUDY OF THE CONDITIONS OF ORIGIN OF THE 

 PERMOCARBONIFEROUS AND TRIASSIC RED BEDS OF THE WESTERN 

 UNITED STATES. PART I - - - - - - - C. W. Tomlinson 



STUDIES IN HYDROTHERMAL ALTERATION. I - - - - E. A. Stephenson 



ZONAL WEATHERING OF A HORNBLENDE GABBRO 



Albert D. Brokaw and Leon P. Smith 



REVIEWS - - - - ■" - ■ - "- - - - - - - - - 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO, ILLINOIS, U.S.A. 



10S 

 123 



130 



iS3 



180 



200 

 206 



Agents 



THE CAMBRIDGE UNIVERSITY PRESS, London and Edinburgh 



KARL W. HIERSEMANN, Leipzig 



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



