TITLES OF PAPERS 189 



MARSUPIAL FROM THE JOHN DAY OLIGOCENE OF LOGAN BUTTE, OREGON 

 BY CHESTER STOCK AND E. L. FURLONG 



Presented extemporaneously by Mr. Stock. 



MECHANIC* OF THE SAN ANDREAS FAULT 

 BY BAILEY WILLIS 



Presented extemporaneously. Discussion by Mr. Lawson. 



CERTAIN MARKED DIFFERENTIAL MOVEMENTS IN THE SAN FRANCISCO 



BAY REGION 



BY G. D. LOUDERBACK 



Presented extemporaneously. Discussion by Messrs. Clark and Turner. 



JASPEROID OF THE JOPLIN DISTRICT, MISSOURI, KANSAS, AND OKLAHOMA 



BY W. S. TANGIER SMITH 



This paper was read in full. 



COLLOPHANE, A MUCH-NEGLECTED MINERAL 

 BY AUSTIN F. ROGERS 



Presented extemporaneously and illustrated by lantern slides. Dis- 

 cussion by Messrs. Eakle and Baker. 



DISCUSSION OF THE AGE OF THE BRIONES FORMATION OF MIDDLE 



CALIFORNIA 



BY P. D. TRASK 



Paper read in full. Discussion by Mr. Louderback. 



MONTEZUMA HILLS 

 BY G. A. WILCOX 



Presented extemporaneously. 



SOME NEW ASPECTS OF THE GEOLOGY AT COBALT 

 BY A. R. WHITEMAN 



Presented extemporaneously. Discussion by Mr. Weber. 



At 6.15 the meeting adjourned for dinner at the Faculty Club. In- 

 formal after-dinner talks were made by Dr. J. C. Merriam and Dr. 

 Collier Cobb. 



