VOLUME XXV 



THE 



NUMBER 7 



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 ALBERT JOHANNSEN, Petrology 



STUART WELLER, Invertebrate Paleontology ROLLIN T. CHAMBERLIN, Dynamic Geology 



ALBERT D. BROKAW, Economic Geology 



ASSOCIATE EDITORS 



SIR ARCHIBALD GEIKIE, Great Britain 



CHARLES BARROIS, France 



ALBRECHT PENCE,, 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 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 



OCTOBER-NOVEMBER 1917 



ON THE AMOUNT OF INTERNAL FRICTION DEVELOPED IN ROCKS DURING 

 DEFORMATION AND ON THE RELATIVE PLASTICITY OF DIFFERENT 

 TYPES OF ROCKS - Frank D. Adams and J. Austen Bancroft 597 



ON THE MATHEMATICAL THEORY OF THE INTERNAL FRICTION AND LIMITING 

 STRENGTH OF ROCKS UNDER CONDITIONS OF STRESS EXISTING IN THE 

 INTERIOR OF THE EARTH ---... Louis Vessot King 638 



NOTE ON THE DEPOSITS CONTAINING HUMAN REMAINS AND ARTIFACTS AT 



VERO, FLORIDA 1 ---------- e. H. Sellards 659 



THE FOSSIL PLANTS FROM VERO, FLORIDA - Edward W. Berry 661 



FURTHER STUDIES AT VERO, FLORIDA ----- Rollin T. Chamberlin 667 



ANOTHER LOCALITY OF EOCENE GLACIATION IN SOUTHERN COLORADO 



Wallace W. Atwood 684 



REVIEWS 687 



RECENT PUBLICATIONS 689 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO, ILLINOIS, U.S.A. 



THE CAMBRIDGE UNIVERSITY PRESS, London and Edinburgh 



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



THE MISSION BOOK COMPANY, Shanghai 



