Among articles to appear in early 

 numbers of the Journal of Geology 

 are the following: 



Summaries of P re-Cambrian Literature of North America. Papers 

 V-VII. By Edward Steidtmann. 



Features of a Body of Anorthosite-Gahhro in Northern New York' 

 By William J. Miller. 



A Glacial Gravel Seam in Limestone at Ripon, JVisconsin. By [F. 

 T. Thwaites. 



The Physical Chemistry of the Crystallization and Magmatic Differ- 

 entiation of Igneous Rocks. By J. H. L. Vogt. 



A New Form of Diplocaulus. By M. G. Mehl. 



Volcanic Earthquakes. By Charles Davison. 



The Mechanical Interpretation of Joints. Part II. By Walter H. 



BUCHER. 



Types of Rocky Mountain Structure in Southeastern Idaho. By 



George Rogers Mansfield. 



The Stratigraphic and Faunal Relationships of the Meganos Group, 

 Middle Eocene of California. By Bruce L. Clark. 



Cycles of Erosion in the Piedmont Province of Pennsylvania. By 

 F. Bascom. 



Russell Fork P^^l^ of Southwest Virginia. By Chester K. 

 Wentworth. 



Strand Markings in the {Pennsylvaniati) Sandstones of Osage County, 

 Oklahoma. By Sldney Powers. 



Diastrophism and the Formative Processes. XIV. Megadiastro- 

 phism. By T. C. Chamberlin and R. T. Chamberlin. 



