Contents of Volume XXVIII 



NUMBER I 



PAGE 

 DlASTROPmSM AND THE FORMATIVE PROCESSES. X. ThE OrDER OF 



Magnitude of the Shrinkage of the Earth Deduced from 

 Mars, Venus, and the Moon. T. C. Chamberlin ... i 



The Laws of Elastico-Viscous Flow. II. A. A. Michelson . i8 



The Great Glass-Sponge Colonies of the Devonian; Their 



Origin, Rise, and Disappearance. John M. Clarke . . . 25 



A Quantitative Mineralogical Classification of Igneous Rocks 



— Revised. Part I. Albert Johannsen. 38 



The Pre-Moenkopi (Pre -Permian ?) Unconformity of the Colo- 

 rado Plateau. C. L. Dake 61 



Paleozoic Diastrophics of the Northern Mexican Tableland. 



Charles Keyes 75 



Some Estimates of the Thickness of the Sedimentary Rocks 



of Ohio. T. M. Hills 84 



Recent Publications 87 



NUMBER II 



The Origin of Gumbotil. George F. Kay and J. Newton Pearce . 89 

 diastrophism and the formative processes. xi. selective 

 Segration of Material in the Formation of the Earth and 



Its Neighbors. T. C. Chamberlin 126 



A Quantitative Mineralogical Classification of Igneous Rocks 



— Revised. Part II. Albert Johannsen 158 



Reviews 178 



Recent Publications 182 



NUMBER III 



Compilation and Composition of Bituminous Coals. Reinhardt 



Thiessen 185 



A Quantitative Mineralogical Classification of Igneous Rocks 



— Revised. Part III. Albert Johannsen 210 



Geological Setting of New Mexico. Charles Keyes . . . 233 



