CONTEKTS . XI 



Page 

 ^ Origin of dolomite as disclosed by stains and other methods ; by E. Steidt- 



MANIN^ 431 



'^ A classification of metamorphic rocks ; by W. J. Miller 451 



^ Weathering of allanite ; by T. L. Watson 4G3 



^ Tectonic lines in the Hawaiian Islands ; by S. Powers 501 



v'' Geologic and physiographic influences in the Philippines ; by W. D. Smith . 515 

 ]/ Date of local glaciation in the W^hite, Adirondack, and Catskill Mountains ; 



by D. W. Johnson 543 



/ Revision of the structural classification of petroleum and natural-gas fields ; 



by F. G. Clapp 553 



V General conditions of the petroleum industry and the world's future sup- 



ply ; by R. Arnold 603 



i Appalachian oil field ; by M. L. Fuller 617 



\ Oil fields of Illinois ; by F. H. Kay 655 



'' Petroleum in Ohio and Indiana ; by J. A. Bownocker 667 



V Oil fields of the Pacific coast ; by R. W. Pack 677 



V The mid-continent oil fields ; by J. H. GzVrdner 685 



/ Petroleum in Canada ; by W. G. Miller 721 



y' Late theories regarding the origin of oil ; by D. White 727 



v' Problems of the interpretation of sedimentary rocks; by A. W. Grabau. . . 735 



Rhythms and the measurements of geologic time ; by J. Barrell 745 



Diagnostic characteristics of marine elastics ; by E. M. Kindle 905 



■■ Characteristics of continental elastics and chemical deposits ; by E. Black- 

 welder 917 



Significance of sorting in sedimentary rocks ; by E. W. Shaw 925 



;. Chemical and organic deposits of the sea ; by T. W. Vaughan 933 



y Stratigraphic relationships of the Tully limestone and the Genesee shale 



in eastern North America ; hj A. W. Grabau 945 



Were the graptolite shales, as a rule, deep or shallow water deposits? by 



A. W. Grabau and Marjorie O'Connell 959 



^ Geologic significance of fossil rock-boring animals ; by A. L. Barrows 965 



/ Second report of the Committee on the Nomenclature of the Cranial Ele- 

 ments in the Permian Tetrapoda ; by W. K. Gregory, Secretary of the 

 Committee, with Appendices by R. Broom, D. M. S. W^atson, and S. W. 



WiLLISTON 973 



Index 987 



ILLUSTRATIONS 



Plates 



Plate 1 — Lane : Portrait of Charles A. Davis 14 



" 2 — Smith : Portrait of Eugene Waldemar Hilgard 40 



" 3 — Halberstadt : Portrait of Frank A. Hill 67 



" 4 — CuMiNGS : Portrait of Charles Smith Prosser 70 



" 5 — Brooks : Portrait of Charles Willard Hayes 81 



" 6 — Washington : The sciarra from the sea 250 



" 7 '* Crater terrace of Stromboli from the south 251 



