CONTENTS 



Page 

 Proceedings of the Twenty-eighth Annual Meeting of the Geological So- 

 ciety of America, held at Washington, District of Columbia, December 



2S, 29, and 30, 1915 ; Charles P. Berkey, Secretary pro tern 1 



Session of Tuesday, December 28 5 



Report of the Council 5 



Secretary's report 5 



Treasurer's report 7 



Editor's report 9 



Election of Auditing Committee 11 



Election of officers 11 



Election of Fellows 12 



Memorial of Theodore B. Comstock (with bibliography) ; by 



Heinkich Ries 12 



Memorial of Orville A. Derby (with bibliography) ; by J. C. 



Branner 15 



Memorial of Joseph Austin Holmes (with bibliography) ; by J. H. 



Pratt 22 



Memorial of William John Sutton ; by W. F. Robertson 35 



Memorial of A. B. Willmott (with bibliography) ; by A. P. Cole- 

 man 37 



Titles and abstracts of papers presented before the morning ses- 

 sion and discussions thereon 38 



Geographic history of the San Juan Mountains since the 

 close of the Mesozoic era [abstract] ; by Wallace W. At- 



wood and Kirtley W. Mather 38 



Dominantly fluviatile origin, under seasonal rainfall, of the 



Old Red Sandstone [abstract]; by Joseph Barbell 39 



Influence of Silurian-Devonian- climates on the rise of air- 

 breathing vertebrates [abstract] ; by Joseph Babbell 40 



Some littoral and sublittoral physiographic features of the 

 Virgin and northern Leeward Islands and their bearing on 

 the coral-reef problem [abstract] ; by Thomas Wayland 



Vaughan 41 



Coral-reef problem [abstract] ; by W. M. Davis 46 



Tertiary-Quaternary orogenic history of the Sierra Nevada 

 in the light of recent studies in the Yosemite region [ab- 

 stract] ; by F. E. Matthes 40 



Titles and abstracts of papers presented before the afternoon ses- 

 sion and discussions thereon 47 



Geological transformations of phosphorus [abstract] ; by 



Eliot Blackwelder 47 



Diffusion in silicate melts [abstract and discussion] ; by N. L. 



BOWEN < s 



(iii) 



