BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA PROCEEDINGS OF THE THIRTY-FIRST ANNUAL MEETING OF THE GEOLOGICAL SOCIETY OF AMERICA, HELD AT BALTIMORE, MARYLAND, DECEMBER 27 AND 28, 1918. Edmund Otis Hoyey, Secretary CONTENTS Page Session of Friday, December 27........................................................................ 4 Report of the Council.................................................................................... 4 Secretary’s report................................................................................... 4 Treasurer’s report................................................................................... 7 Editor’s report.......................................................................................... 9 Election of Auditing Committee.................................................................. 11 Election of officers.......................................................................................... 11 Election of Fellows......................................................................................... 12 Necrology......................................................................................................... 12 Memorial of Garland Carr Broadhead (with bibliography); by Charles R. Keyes...................................................................................................... 13 Memorial of Charles R. Eastman (with bibliography); by Bashford Dean.............................................................................................................. 27 Memorial of John D. Irving (with bibliography); by James F. Kemp. 37 Memorial of P. H. Mell (with bibliography) ; by Fred H. H. Calhoun. 43 Memorial of Henry S. Williams (with bibliography) ; by Herdman F. Cleland.................................. ...................................................................... 47 Memorial of Samuel Wendell Williston; by Henry Fairfield Osborn.. 66 Report of Committee on Publication of Map of Brazil.......................... 76 Report of Committee on Photographs....................................................... 76 Titles and abstracts of papers presented at the morning session and discussions thereon...................................................................................... 77 Geology as a basis of citizenship [abstract]; by Joseph E. Pogue. 77 Sources and tendencies in American geology [abstract]; by Joseph Barrell.................................................................................................. 77 Geology as a synthetic science [abstract] ; by Warren D. Smith.. 77 United States Geological Survey as a civic institution during the war [abstract] ; by Sidney Paige................................................... 78 Military contribution of civilian engineers [abstract]; by George Otis Smith............................................................................................. 79 Presentation of geological information for engineering purposes [abstract]; by T. Wayland Vaughan.............................................. 79 I—Boll. Geol. Soc. Am., Yol. 30, 1918 (1) 2 PROCEEDINGS OF THE BALTIMORE MEETING Page Engineering geology in and after the war [abstract and discus­ sion] ; by Charles P. Berkey........................................................... 81 Geology in the students’ army training corps [abstract] ; by Her­ bert E. Gregory................................................................................... 81 War work by the department of geology at the University of Ore­ gon [abstract]; by Warren D. Smith........................................... 83 Titles and abstracts of papers presented before the afternoon session and discussions thereon............................................................................ 83 Recent earthquakes of Porto Rico [abstract] ; by Harry Fielding Reid and Stephen Taber................................................................... 83 Structure of the Pacific ranges, California [abstract and discus­ sion] ; by Bailey Willis...................................................................... 84 Migration of geosynclines [abstract] ; by Amadeus W. Grabau... 87 Geotectonic adaptation through retardation of the earth’s rota­ tion [abstract] ; by Charles R. Keyes............................................ 87 Late Mississippian orogenic movements in North America [ab­ stract] ; by Francis M. Van Tuyl and Raymond C. Moore.......... 88 Post-Glacial uplift of the New England coastal region [abstract] ; by Herman L. Fairchild................................................................... 89 Topographic features of the Hudson Valley and the question of post-Glacial marine waters in the Hudson-Champlain Valley [abstract and discussion] ; by James H. Stoller.......................... 90 Subterranean “chalk-streams” of northern France [abstract] ; by Edward Moore Burwash................................................................... 91 Relative efficiency of normative and modal classifications of igne­ ous rocks [abstract] ; by Edward B. Mathews............................. 91 Pegmatite, silexite, and aplite dikes of northern New York [ab­ stract] ; by William J. Miller..................................................... 93 Magnetic iron-ore deposits of Clinton County, New York [ab­ stract] ; by William J. Miller........................................................... 93 Session of Friday evening, December 27......................................................... 94 Cooperation in geological instruction [abstract] ; by Herbert E. Gregory................................................................................................... 94 Session of Saturday morning, December 28..................................................... 95 Report of the Auditing Committee............................................................ 95 Titles and abstracts of papers presented at the morning session and discussions thereon..................................................................................... 95 High-grade clays of the United States [abstract] ; by H. Ries___ 95 Occurrence and origin of white clays at Saylorsburg, Monroe County, Pennsylvania [abstract] ; by Frederick B. Peck........... 96 Oil geology in relation to valuation [abstract] ; by Ralph Arnold. 96 Rock products and the war [abstract] ; by G. F. Loughlin........... 97 Manganese ore as a war mineral [abstract] ; by D. F. Hewett___ 97 Economic limits to domestic independence in minerals [abstract and discussion] ; by George O. Smith............................................ 98 Imperial Mineral Resources Bureau, London ; by Willet G. Miller. 100 Some problems of international readjustment of mineral supplies as indicated in recent foreign literature [abstract and discus­ sion] ; by Eleanora F. Bliss............................................................ 101 CONTENTS 3 Page War-tlme development of the optical industry [abstract] ; by F. E. Wright................... ............................................................................. 103 Geologic and present climates ; by Marsden Manson...................... 103 Conditions of deposition of some Tertiary petroliferous sediments [abstract]; by Amadeus W. Grabau............................................. 103 Phosphate rock an economic army [abstract] ; by R. W. Stone... 104 Prevailing stratigraphie relationships of the bedded phosphate deposits of Europe, North Africa, and North America [ab­ stract] ; by Amadeus W. Grabau.................................................... 104 Session of Saturday afternoon, pecember 28................................................... 104 Titles and abstracts of papers presented at the afternoon session___104 Principles in the determination of boundaries [abstract] ; by Al­ bert P. Brigham.................................................................................. 105 Geographic description of army cantonments and of United States boundary regions; by M. R. Campbell............................................ 106 Signal. Corps School of Meteorology [abstract]; by Oliver L. Fassig................................................................................................... 106 World view of mineral wealth [abstract] ; by Joseph B.Umpleby. 107 Internationalization of mineral resources [abstract] ; by C. K. Leith...................................................................................................... 107 Commercial control of the mineral resources of the world [ab­ stract] ; by Josiah Edward Spurr................................................... 108 Mexican petroleum and the war [abstract] ; by E. W. Shaw..........109 American mapping in France ; by Glenn S. Smith.......................... 110 The American topographer in the rôle of artillery orientation officer ; by F. E.'Matthes............................................................... 110 The method of aerial topographic mapping ; by Fred H. Moffit and J. W. Bagley..................................................................................:.. 110 A plane-table for "military mapping [abstract] ; by Alan M. Bate- m au....................................................................................................... Ill Sand-chrome deposits of Maryland [abstract] ; by Joseph T. Singewald, J r............................................................................... Ill Cartersville potash slates: their economic relation to chemical and industrial post-war development [abstract] ; by T. Poole Maynard....,