VOLUME XXVIII 



NUMBER 8 



THE 



Journal of Geology 



A Semi-Quarterly 



Edited By 

 thomas c. chaiviberlin and rollin d. salisb 



With the Active Collaboration of 



STUART WELLER, 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 



CHARLES D. WALCOTT, Smithsonian Institution 



JOSEPH P. IDDINGS, Washington, D.C. 



JOHN C. BRANNER, Leland Stanford Junior University 

 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, Harvard University 

 WILLIAM H. EMMONS, University of Minnesota 

 ARTHUR L. DAY, Carnegie Institution 



NOVEMBER-DECEMBER 1920 



DIASTROPHISM AND THE FORMATIVE PROCESSES. XIII. THE BEARINGS OF 

 THE SIZE AND RATE OF INF ALL OF PLANETESIMALS ON THE MOLTEN OR 

 SOLID STATE OF THE EARTH - - - - - - - T. C. Chamberlin 665 



A PLEISTOCENE PENEPLAIN IN THE COASTAL PLAIN - - Herd.\n F. Cleland 702 



THE MECHANICAL INTERPRETATION OF JOINTS - - - Walter H. Bucher 707 



GEOLOGIC RECONNAISSANCE OF THE SOUTHERN PART OF THE TAOS RANGE, 



NEW MEXICO ---,------- John W. Gruner 731 



SUMMARIES OF PRE-CAMBRIAN LITERATURE OF NORTH AjMERICA 



Edw.^rd Steidtmann 743 



RECENT PUBLICATIONS 752 



INDEX - 755.^/ 



THE UNIVERSITY OF CHICAGO 



CHICAGO, ILLINOIS, U.S.A. 



PRESS 



^ THE CAMBRIDGE UNIVERSITY PRESS, London 

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

 THE MISSION BOOK COMPANY, Shanghai 



