INDEX TO VOLUME XXX 727 



PAGE 



Clastic Sediments, a Scale of Grade and Class Terms for. By Chester 



K. Wentworth 377 



Coal. By Elwood S. Moore. Review by C. R. S 717 



Coal in 1918. Part A: Production. By C. E. Lesher. Review by 



E. S. B 264 



Coal, OU, Limestone, and Iron Ore Map, New Edition of. By West 



Virginia Geological Survey. Author's Abstract 418 



Colby, Charles C. Source Book for the Economic Geography of North 



America. Review by R. D. S 82 



Collins, W. H. An Outline of the Physiographic History of North- 

 eastern Ontario 199 



Contact-Metamorphic Tungsten Deposits in the United States. By 



Frank L. Hess and Esper S. Larsen. Review byE.S.B. . . 719 

 Contact Phenomena between Gneiss and Limestone in Western 



Massachusetts, On. By Pentti Eskola 265 



Contributions to the Pre-Cambrian Geology of Northern Michigan and 



Wisconsin. By R. C. Allen and L. P. Barrett. The Geology of 



Limestone Mountain and Sherman Hill in Houghton County, 



Michigan. By E. C. Case and W. I. Robinson. Review by A. C. 



McF 85 



Cooke, H. C. Geology of the Matachewan District, Northern Ontario. 



Review by C. H. B., Jr 424 



Copper Deposits of Ray and Miami, Arizona, The. By Frederick 



LesHe Ransome. Review by E. S. B. and C. H. B 325 



Copper Shales, The Mineralization of the. By F. Beyschlag. Review 



by E. S. B 723 



Cox, G. H., Dake, C. L., and Muilenburg, G. A. Field Methods in 



Petroleum Geology. Review by W. O. G 332 



Cressey, George B. Notes on the Sand Dunes of Northwestern Indiana 248 

 Crinoid Genus Scyphocrinus and Its Bulbous Root Camarocrinus, On 



the. By Frank Springer. Review by A. C. McF 259 



Criticism of the "Faunal Relationships of the Meganos Group" by 



Bruce L. Clark, A. By Roy E. Dickerson 295 



Crosby, Irving B. Former Courses of the Androscoggin River . . 232 

 Crystallization and Magmatic Differentiation of Igneous Rocks, The 



Physical Chemistry of the. V. By J. H. L. Vogt .... 611 

 Crystallization and Magmatic Differentiation of Igneous Rocks, The 



Physical Chemistry of the. VI. By J. H. L, Vogt .... 659 

 CrystobaUte in California, A New Occurrence of. By Austin F. Rogers 211 

 Cushman, Joseph A. The American Species of Orthophragmina and 



Lepidocyclina. Review by A. C. McF 260 



Dake, Charles Laurence. The Problem of the St. Peter Sandstone. 



Review by R. D. S 646 



