VOLUME XXII 



NUMBER 8 



THE 



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 WELLER 



Invertebrate Paleontology 



ALBERT JOHANNSEN 

 Petrology 



WALLACE W. ATWOOD 

 Physiography 



WILLIAM H. EMMONS 



Economic Geology 



ROLLIN T. CHAMBERLIN 

 Dynamic Geology 



ASSOCIATE EDITORS 



SIR ARCHIBALD GEIKIE, Great Britain 

 *HEINRICH ROSENBUSCH, Germany 

 *THEODOR N. TSCHERNYSCHEW. Russia 



CHARLES BARROIS, France 



ALBRECHT PENCK, Germany 



HANS REUSCH, Norway 



GERARD DeGEER, Sweden 



ORVILLE A. DERBY, Brazil 



T. W. EDGEWORTH DAVID, Australia 



BAILEY WILLIS, Argentine Republic 

 *Deceased. 



GROVE K. GILBERT, M^ashington, D.C. 

 CHARLES D. W^ALCOTT, 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 



NOVEMBER-DECEMBER 1914 



THE STRENGTH OF THE EARTH'S CRUST. VII. VARIATION OF STRENGTH WITH 

 DEPTH AS SHOWN BY THE NATURE OF DEPARTURES FROM ISOSTASY 

 (Section A) - Joseph Barrell 729 



THE ANALCITE BASALTS OF SARDINIA - - - - - - H. S. Washington 742 



ON THE CONDITIONS UNDER WHICH THE VEGETABLE MATTER OF THE ILLI- 

 NOIS COAL BEDS ACCUMULATED - - - - - - - T. E. Savage 754 



BEREA SANDSTONE IN ERODED CLEVELAND SHAI.E - Wilbur Greeley Burroughs 766 



THE AVERAGE IGNEOUS ROCK - - - - W. J. Mead 772 



EOCENE HORIZONS OF CALIFORNIA ------ Clarence A. Waring 782 



CONTEMPORANEOUS DEFORMATION: A CRITERION FOR AQUEO-GLACIAL SEDI- 

 MENTATION ----- Frederic H. Lahee 786 



PROBLEMS OF PETROGRAPHIC CLASSIFICATION SUGGESTED BY THE "KODURITE 



SERIES" OF INDIA --------- Whitman Cross 791 



A PHENOMENON OF THE KANSAN DRIFT IN NEBRASKA - - Erwin H. Barbour 807 



EDUARD SUESS --------- William Herbert Hobbs 811 



REVIEWS --------- -------- 818 



RECENT PUBLICATIONS ..-------.--- 819 



INDEX TO VOLUME XXII ------- - 825 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO, ILLINOIS, U.S.A. 



Agents 



THE CAMBRIDGE UNIVERSITY PRESS, London and Edinburgh 



KARL W. HIERSEMANN, Leipzig 



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



