vi CONTENTS TO VOLUME XXXI 



PAGE 



The Red Beds of the Feont Range in Colorado: A Study in Sedi- 

 mentation.' A. J. Tieje 192 



IsosTASY AS A RESULT OF Earth SHRINKAGE. Francis Parker Shepard 208 



The Devonian Limestone at St. George, Quebec. Thomas H. 



Clark 217 



Did Crater Lake, Oregon, Originate by a Volcanic Subsidence 



OR an Explosive Eruption? J. S. Diller 226 



An Improved Recording Micrometer for Rock Analysis. Chester 



K. Wentworth 228 



The Physical Chemistry of the Crystallization and Magmatic 



Differentiation of Igneous Rocks. J. H. L. Vogt ... 233 



Reviews . 253 



NUMBER IV 



The Differentiation of the Drift Sheets of Northwestern 



Illinois. Morris M. Leighton 265 



The Mineralography of the Feldspars, Part II. Harold L. AUing 282 

 A Preliminary Report on the Microscopy of Anthracite Coal. 



Homer G. Turner and H. R. Randall 306 



Geology of the Philipsberg Region of Quebec with Notes on 



Correlations with the Beekmantown. J. H. Bradley, Jr. . 314 



Folds Resulting from Vertically Acting Forces. W. I. Robinson 336 



A Paleozoic Angiosperm. A. C. Noe ' . . 344 



Communication 348 



Reviews 349 



NUMBER V 



The Mineralography of the Feldspars, Part II {Concluded). 



Harold L. AUing 353 



Significant Ameliorations of Present Arctic Climates. T. C. 



Chamberlin 37^ 



The Physical Chemistry of the Crystallization and Magmatic 



Differentiation of Igneous Rocks. J. H. L. Vogt . . . 407 

 The Temporary Mississippi River. Walter H. Schoewe . . . 420 

 Reviews 433 



