120 proceedings of the cordilleran section 



Session of Feiday, Apeil 11 



The Fourteentli Aimiial Meeting of the Cordilleran SectioD of the 

 Geological Society of America was held in conjunction with the Pacific 

 Association of Scientific Societies at the University of California, Berke- 

 ley, April 11 and 12, 1913, in room 105, Bacon Hall. In the absence of 

 the chairman, the first meeting was called to order Friday, April 11, at 

 2.15 p. m., by the secretary of the section. Prof. A. C. Lawson was 

 elected temporary chairman. 



Minutes of the Thirteenth Annual Meeting were read and approved. 



On motion of the secretary, it was voted to postpone the business until 

 Saturday, and tlie scientific program was taken up. The following papers 

 were presented in the order given : 



,^OME GRAPHIC METHODS FOR THE SOLUTIOX OF GEOLOGIC PROBLEMS 

 BY W. S. TANGIER SMITH 



Eead by title in the absence of the author. 



POLARIZED SKYLIGHT ASD THE PETROGRAPHIC MICROSCOPE 

 BY W. S. TANGIEB SMITH 



(A1)stra€t) 



This paper deals with the effects of polarized skylight in petrographic in- 

 vestigations and the means by which these effects may be overcome, especially 

 by the use of a simple compensator placed before the polarizer of the micro- 

 scope. 



Eead from manuscript and discussed by the secretary. 



APPAREXT LIMITS OF FORMER GLACIATION IN THE NORTHERN COAST 

 RANGES OF CALIFORNIA 



BY B. S. HOLWAY 



(Abstract) 



It has long been known that certain areas in the Sierra Nevada and the 

 Klamath Mountains of California were glaciated during Pleistocene time. 

 Glaciation in the Coast Ranges proper was first announced by the writer in 

 1911. The locality is Snow Mountain, 7,039 feet high, in latitude 39° 22' north 

 and at the northwestern corner of Colusa Countj'. Two reconnaissance trips 

 since then seem to fix the limits of the glaciated area to favorable situations 

 on the high peaks within a triangle roughly bounded by Snow Mountain, Black 

 Butte in the northwest comer of Glenn County, and Hull Mountain in the 



