INDEX TO VOLUME I. ix 



The Making of the Geological Time-Scale. Studies for Students. H. S. 



Williams. - - - - " - - - - 180 



Trenton Gravels. Are there Traces of Glacial Man in the Trenton Gravels ? 



W.H.Holmes. '------- I5 



Upham, Warren. The Age of the Earth. (Abstract). ~ 203 



Van Hise, C. R. An Historical Sketch of the Lake Superior Region to Cam- 

 brian Time. Plate I. - - - - - - 113 



Some Dynamic Phenomenon shown by the Baraboo Quartzite Ranges of 



Central Wisconsin. - ' - - - - - - 347 



Summary of Pre-Cambrian North American Literature. Abstract, with 



comments. ---.... 304, 532 



Volcanic Rocks. The Volcanic Rocks of the Andes. J. P. Iddings. - - 164 



The Structures, Origin, and Nomenclature of the Acid Volcanic Rocks of 



South Mountain. F. Bascom. ------ 813 



Walcott, C. D. Geologic Time, as Indicated by the Sedimentary Rocks of 



North America. ------- 630. 



Westgate, Louis G. Geographic Development of the Eastern Part of the Mis- 

 sissippi Drainage System. (Abstract). - 420 

 White, David. A New Teeniopteroid Fern and Its Allies. (Abstract). - 419 

 Review. Monographs of the United States Geological Survey, Vol. 



XVII. The Flora of the Dakota Group, by Leo Lesquereaux. - - 300 



Williams, G. H. On the Use of the Terms Poikilitic and Micropoikilitic in 



Petrography. - - - - - - - 176 



Reviews. Crystalline Rocks from the Andes. Reports of B. Kiihn, 



P. Sabersky, J. Romberg. - - - - - -411 



Recent Contributions to the Subject of Dynamometamorphism from the 



Alps. A. Heim, C. Schmidt, L. Milch, M. P. Termier. - - 580 



Williams, H. S. Elements of the Geological Time-Scale. Studies for Stu- 

 dents. -------- 283 



Geology as a Part of a College Curriculum. - - - 38 



Making of the Geological Time-Scale. Studies for Students. - 180 



Willis, Bailey. Conditions of Sedimentary Deposition. Studies for Students. 476 

 Conditions of Appalachian Faulting (C. W. Hayes). (Abstract). - 861 



Studies in Structural Geology. (Abstract). - 96 



Winslow, Arthur. Notes on the Lead and Zinc Deposits of the Mississippi 



Valley and the Origin of the Ores. -..-.- 612 

 Wisconsin. Some Dynamic Phenomena Shown by the Baraboo Quartzite 



Ranges of Central Wisconsin. C. R. Van Hise. - 347 



Wyoming. A Dissected Volcano of Crandall Basin, Wyoming. Joseph P. 



Iddings. -.--.-.. 606 



Zinc. Notes on the Lead and Zinc Deposits of the Mississippi Valley and the 



Origin of the Ores. Arthur Winslow. - - - - 612 



