130 ■ proceedings of the cordilleran section 



Session of Thursday, May 21 



The Fifteenth Annual Meeting of the Cordilleran Section of the 

 Geological Society of America was held in conjunction with the Pacific 

 Association of Scientific Societies, at the University of Washington, 

 Seattle, Washington, j\Iay 21 and 23, 1914, in room 3, Science Hall. In 

 the absence of the cliairman, the meeting was called to order at 10.15 

 a. m. by the secretary of the section. Prof. A. C. Lawson was elected 

 temporary chairman. 



It was voted that the business session be held at 1.30 p. m., and that 

 the morning be devoted to the "reading of scientific papers. The secre- 

 tary reported that the nominations sent in by mail were too scattering 

 to definitely indicate a nomination for chairman for the ensuing year, 

 and moved that a nominating committee be appointed to report at the 

 business session. The motion was seconded and carried and the tem- 

 porary chairman a]ipoiiit(Ml Londerback, Weaver, and Saunders as such 

 committee. 



The following papers were then presented in the order given: 



PRE-PLEISTOCENE GEOLOGY IN THE VICINITY OF SEATTLE ' 

 BY CHARLES E. WEAVER 



(Ahstract) 



The larger part of Seattle is heavily covered over with deposits of glacial 

 drift. From the western foothills of the Cascades a prominent structural up- 

 \\arp extends northwesterly through Seattle into Kitsap County. Along the 

 axis of this uplift the older Tertiary formations are exposed. They consist 

 of approximately 4,000 feet of EJocene sedimentaries and volcanics containing 

 a Tejon fauna and productive coal measures. Overlying these are at least 

 7.000 feet of Lower Miocene sandstones and shales. These strata have been 

 folded. A prominent anticlinal axis extends along the line of uplift. On the 

 north and south flanks of this fold north and south minor anticlinal and 

 synclinal folds have been developed. During the late Tertiary these were sub- 

 jected to vigorous erosion and during the Pleistocene were glaciated. 



Presented from notes and illustrated by geologic map. 



Discussion 



In reply to question by Mr. Bretz. the author explained that the south limb 

 of the anticline was covered and its detailed structure not known. Answering 

 question by Merriam, he stated that the Miocene involved includes the lowest 

 zone. In reply to question by Londerback, author held that there were no pre- 

 Eooene lavas involved, as at certain localities fossiliferous Eocene strata are 

 found below the lowest lavas. 



