(Contents vii 



Page 

 Eocene divisions of California [abstract] ; by Bruce L. Clark 154 

 Some problems of the Adirondack Precambrian [abstract] ; 



by Harold L. Alling 155 



Permo-Triassic of northwestern Arizona [abstract] ; by Har- 

 vey W. Shimer 155 



Stratigraphy and structure of the Newark system in Mary- 

 land and its relation to the Newark system of eastern North 



America [abstract] ; by George Edwin Dorset 155 



Remarkable persistence of thin horizons [abstract] ; by 



George Halcott Chad wick 157 



Portage stratigraphy in western New York [abstract] ; by 



George Halcott Chadwick 157 



Stromatopora growth on edge-on conglomerate from the 



Silurian ; by John M. Clarke 157 



Register of the Baltimore meeting, 1918 158 



Officers, Correspondents, and Members of the Paleontological Society . . 159 

 Geology in the world war and after; Presidential address by Whitman 



Cross 165 



Outlines of the geology of Brazil to accompany the geologic map of Brazil ; 



by John Casper Branner , 189 



fJeology and stratigraphy of the area of Paleozoic rocks in the vicinity of 



Hudson and James bays ; by T. E. Savage and Francis M. van Tuyl. . . 339 

 Camarasaurus, Amphicoelias, and other sauropods of Cope ; by Henry Fair- 

 field OsBORN and Charles Craig Mook 379 



Chalk, flints and ground-water of northern France; by Edward M. Bur- 

 wash 389 



Military contribution of civilian engineers ; by George Otis Smith 399 



Military and geologic mapping — a plane-table ; by Alan M. Bateman .... 405 

 Significance of the Sherburne sandstone in upper Devonic stratigraphy; 



by Amadeus W, Brabau 423 



Permo-Triassic of northwestern Arizona ; by Henry W. Shimer 471 



Evolution of geologic climates ; Presidential address by F. H. Knowlton . 499 

 Coal Measures of Maryland ; by Charles K. Swartz, W. Armstrong Price, 



Jr., and Harvey Bassler 567 



Post-Glacial uplift of southern New England; by Herman L. Fairchild. . . 597 

 Index 637 



ILLUSTRATIONS 



Plates 



Page 



Plate 1 — Keyes : Portrait of G. C. Broadhead 13 



2 — Dean : Portrait of C. R. Eastman 27 



3 — Kemp : Portrait of J. D. Irving 37 



4 — Calhoun : Portrait of P. H. Mell 43 



5 — Cleland : Portrait of H. S. Williams 47 



6 — Osborn : Portrait of S. W. Williston 66 



