vi CONTENTS OF VOLUME XVIII 



PAGE 



The Appalachian Folds of Central Pennsylvania. Rollin T. 



Chamberlin . . . , . . . ... 228 



The Evidence of the Flora Regarding the Age of the Raritan 



Formation. Edward W. Berry , . . . . .252 



The Secondary Structures of the Eastern Part of the Baraboo 



QuARTZiTE Range, Wisconsin. Edward Steidtman . . . 259 



Diabase of the Cobalt District, Ontario. Reginald E. Hore . 271 



The Collecting Area of the Waters of the Hot Springs, Hot 



Springs, Arkansas. A. H. Purdue ..... 279 



Reviews ......... . 286 



NUMBER IV 



Origin of the Pegmatites of Maine. Edson S. Bastin . . 297 



The Solution of Gold in the Surface Alterations of Ore Bodies. 



Albert D. Brokaw . 321 



Earthquakes in Brazil. J. C. Branner ..... 327 



Notes on the Geology of Carrizo Mountain and Vicinity, San 



Diego County, Cal. Walter C. Mendenhall .... 336 



Amphibian Footprints from the Mississippi of Virginia. E. B. 



Bronson .......... 356 



Rock Glaciers in Alaska. Stephen R. Capps, Jr. . . . . 359 



The Glacial Lake Missoula. J. T. Pardee .... 376 



Reviews 387 



NUMBER V 



Notes on the Geological Section of Michigan. II. From the 



St. Peter Sandstone Up. A. C. Lane ..... 393 



Cretaceous-Eocene Contact. Eugene Allen Smith . . . 430 



The Influence of the Earth's Rotation upon the Lateral Ero- 

 sion OF Streams. Henry M. Eakin 435 



Glacial Lakes of Puget Sound. J. Harlen Bretz . . 448 



