Contents of Volume VI. 



NUMBER I. 



PAGE 



An Hypothesis to Account for 'the Movement in the Crust of the 



Earth. J. W. Powell --------- i 



Estimates and Causes of Crustal Shortening. C. R. Van Hise- - 10 



Note on the Pressure within the Earth. Charles S. Slichter - - 65 



The Geological versus the Petrographical Classification of Igne- 

 ous Rocks. Whitman Cross - 79 



On Rock Classification. J. P. Iddings ----.-- 92 



Editorial- - - - - - - - - - - - - 112 



Abstracts: Papers read at the Montreal Meeting of the Geological Society 

 of America : Sands and Clays of the Ottawa Basin, by R. W. Ells, 

 117 ; Note on an Area of Compressed Structure in Western Indiana, 

 by Geo. H. Ashley, 118 ; Syenite-porphyry Dikes in the Adirondacks, 

 by H. P. Cushing, 1 19 --------- 117-120 



NUMBER II. 



Brazilian Evidence on the Genesis of the Diamond. Orville A. 



Derby - - - - - - - 121 



The Glaciation of North Central Canada. J. Burr Tyrrell - - 147 



The Use of Local Names in Geology. Charles R. Keyes - - 161 



The Weathered Zone (Sangamon) Between the Iowan Loess and 



Illinoian Till Sheet. Frank Leverett - - - - - 171 



Studies in the Driftless Region of Wisconsin. II. G. H. Squier - 182 



Fucoids OR Coprolites. J. A. Udden - - - - - - 183 



Zirkelite — A Question oe Priority. M. E. Wadsworth - - - 199 



Editorial- ------------ 201 



Reviews : Fourteenth Annual Report of the New York State Geologist for 

 1894, by James Hall (review by Stuart Weller), 205 ; Petrology for 

 Students, An Introduction to the Study of Rocks under the Micro- 



