194 PROCEEDINGS OF THE CORDILLERAN SECTION 



Session was resumed at 11.35 and the following paper was presented: 



CENOZOIC HISTORY OF THE GROUND SLOTH GROUP 

 BY CHESTER STOCK 



{Abstract) 



The gravigrade edentates afford an interesting example of mammalian evo- 

 lution during the Cenozoic in America. They are intimately associated with 

 the Tertiary and Pleistocene histories of North and South America and indi- 

 cate former land connections between the two continents, with evidence as to 

 the periods of such connections. Genera of the ground sloth group, known 

 from the Miocene, Pliocene, and Pleistocene, arrange themselves in phylo- 

 genetic series illustrating principles of paleontology. 



Discussion by Messrs. Buell and Bailey Willis. 

 The meeting adjourned at 12.18. 



BUSINESS MEETING 



A business meeting of the Cordilleran Section was called at 12.25. 

 The following delegates to the Affiliation Committee were chosen: 

 G. D. Louderback and W. D. Smith. 



NOMINATION OF OFFICERS 



On account of the small number of Fellows present, it was decided that 

 instead of electing officers for the coming year the meeting should con- 

 sider itself a Nominating Committee, and that the Acting Secretary 

 should send to the members of the Cordilleran Section ballots for a vote 

 by mail for officers for the year 1919-20. 



The following names were chosen : 



For Chairman, George D. Louderback. 

 For Secretary, A. F. Eogers. 

 For Councilor, C. F. Tolman, Jr. 



The regular meeting of the afternoon for presentation of papers was 

 called to order at 2.15. 



EXHIBIT OF LANTERN SLIDES 

 BY WARREN D. SMITH 



Mr. Smith exhibited a series of lantern slides illustrating various fea- 

 tures of Oregon geology and physiography and called attention to various 

 problems in Oregon geology. 



