Articles to appear in the early numbers 

 of The Journal of Geology: 



The Paleozoic Section of the Tomah and Sparta 

 Quadrangles, Wisconsin. By W. H. Twenhofp:l 

 and F. T. Thwaits. 



The Horizon of the Marine Jurassic of Utah. By 

 C. L. Dake. 



A Quantitative Mineralogical Classification of Igneous 

 Rocks — Revised. By Albert Johannsen. 



The Rigidity of the Earth. By A. A. Michelson, 

 H. G. Gale, and F. R. Moulton. 



Notes on Principles of Oil Accumulation. By A. W. 



McCoy. Discussed by Chester W. 

 Washburne. 



The West Point Salt Dome, Freestone, County, Texas. 

 By E. deGolyer. 



Some Estimates of the Thickness of the Sedimentary 

 Rocks of Ohio. By T. M. Hills. 



A Peculiar Belt of Oblique Faulting. By Rollin T. 

 Chamberlin. 



The Great Glass-Sponge Colonies of the Devonian; 

 their Origin, Rise, and Disappearance. By J. M. 



Clarke. 



Diastrophism and the Formative Processes. X. The 

 Order of Magnitude of the Shrinkage of the Earth 

 Deduced from Mars, Venus, and the Moon. By 

 T. C. Chamberlln. 



