ABSTRACTS OF PAPERS VO 



TOPOGRAPHY AND GEOLOGY OF THE OKAXOGAX HIGHLANDS AND COLUMBIA 



PLATEAU OF M'ASHINGTON 



BY SOLOX SIIEDD 



(Ahstract) 



A general discussion of the surface features and geology of the eastern part 

 of Washington. The Okanogan Highlands constitute a large area of meta- 

 morphic rocks, part of which was probably originally sedimentary and part 

 igneous. Tlie Columbia Plateau, as used in this paper, refers to that part of 

 the great lava field, in the northwestern part of the United States, which lies 

 within the State of Washington. The surface features of parts of this area 

 are very interesting and are a result, partly at least, of the action of the wind. 



Read by title. 



TERTIARY STRATIGRAPHY IN THE LOWER RIO GRANDE REGION 

 BY ARTHUR C. TROWBRIDGE 



i Abstract) 



A reconnaissance map is presented covering about 13,500 square miles in 

 extreme south Texas. Formations are described. A change in the strike from 

 a northeast-soutliwest direction in Medina County to a north-south direction 

 in Webb County, and to a north by northwest-south by southeast direction in 

 Zapata and Starr counties, explains some previous differences of opinion con- 

 cerning the ages of beds and faunas along the Rio Grande between Laredo 

 and Rio Grande City. Partly on stratigraphic evidence and partly on the 

 basis of fossil plants identified by Berry, the Carrizo sandstone of Owen is 

 placed in the Wilcox rather than in the Claiborne, and a new formation, the 

 Bigford, is recognized between the Carrizo and the Mount Selman, the lowest 

 Claibornian formation. 



Read by title. 



The section adjourned at -i.S? ^. ni. 



ANNUAL DINNER 



At 7 o'clock p. m. the Society and its visitors and guests, together with 

 members of the Paleontological Societ}^, the Mineralogical Society of 

 America^, the Society of Economic Geologists, and the Association of 

 American Geographers, assembled in the Michigan Union for the annual 

 dinner. There was a very large attendance, and the attractive appoint- 

 ments of the place, with its splendid service, made this one of the most 

 successful and enjoyable events of the kind ever experienced by the 

 Society. 



President Schuchert presided and in due time, with appropriate re- 

 marks, introduced Prof. H. E. Gregory, who served as toastmaster. In- 



