BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol 33, pp. 187-190 March 3i, 1922 



PROCEEDINGS OF THE TWENTIETH ANNUAL MEETING* 

 OF THE COBDILLEKAN SECTION OF THE GEOLOGICAL 

 SOCIETY OF AMERICA, HELD AT BERKELEY, CALIFOR- 

 NIA, MARCH 26, 1921. 



Austin F. Rogers, Secretary 



CONTENTS 



Page 



Session of March 2G 188 



Election of officers for 1921 188 



Program of papers 188 



Correlation and paleogeography of the marine tertiary of Cali- 

 fornia [title] ; by Bruce L. Clark 188 



Probable occurrence of massive troilite in serpentine [title] ; by 



A. S. Eakle 188 



Jurupaite, a new mineral from Crestmore, California [title] ; by 



A. S. Eakle 188 



Late Tertiary mammalian remains from near Alturas, northeast- 

 ern California [title]; by Chester Stock 18S 



Marsupial from the John Day Oligocene of Logan Butte, Oregon 



[title] ; by Chester Stock and E. L. Furlong 189 



Mechanics of the San Andreas fault [title] ; by Bailey Willis 189 



Certain marked differential movements in the San Francisco Bay 



region [title] ; by G. D. Louderback 189 



Jasperoid of the Joplin District, Missouri, Kansas, and Oklahoma 



[title] ; by W. S. Tangier Smith 189 



Collophane, a much-neglected mineral [title] ; by Austin F. Rogers 189 

 Discussion of the age of the Briones formation of middle Cali- 

 fornia [title] ; by P. I). Trask 180 



Montezuma Hills [title] ; by G. A. Wilcox 189 



Some new aspects of the geology at Cobalt [title] ; by A. R. 



Whiteman I89 



Business session of the Section 190 



Register of the California meeting, 1921 190 



* Secretary Rogers, of the Cordilleran Section, telegraphed on June 15, 1922, in re- 

 sponse to a telegraphic inquiry of the Editor, that "No meeting of the Cordilleran Sec- 

 tion was held at Seattle [in 1920]. The geologists present met with the Pacific Coast 

 Section of the Paleontological Society." In view of this fact, the above meeting of 

 March 26, 1921, becomes the twentieth meeting of the Cordilleran Section instead of the 

 twenty-first, as reported by Secretary Rogers. — Editor. 



(187) 



