NEW DEVELOPMENT AT MOUTH OF MISSISSIPPI 791 



The meeting then adjourned for the noon recess. 



The afternoon session was called to order at 1.30 p. m., in room 22, 

 South Hall, and the following papers were read and discussed : 



OCCURRENCE OF THE HALOGEN SALTS OF SILVER AT TONOPAH, NEVADA 

 BY J. A. BURGESS AND A. S. EAKLE 



NEW DEVELOPMENT AT THE MOUTH OF THE MISSISSIPPI 

 BY E. W. HILGARD 



(Al)stract) 



This refers to the uprising of a serious obstacle to navigation outside of the 

 Eads jetties in the South Pass, which has been made the main outlet of the 



Mississippi and of navigation, on account of its being the only one of the 

 Mississippi mouths showing no mud-lump activity. The author predicted, 

 however, in 1869, that when the main current of the river was directed into the 

 pass, such activity would begin within 20 to 30 years, as has now happened. 



CONTRIBUTION TO THE GEOLOGY OF EASTERN OREGON 

 BY E. L. ICKES* 



(Abstract) 



A statement of the general stratigraphy and structural features of eastern 

 Oregon, with a more detailed discussion of certain formations and structures 

 specially studied during a recent field trip in the east central part of the State. 



CALIFORNIA EARTHQUAKES — A SYNTHETIC STUDY OF THE RECORDED 



SHOCKS 



BY H. 0. wood' 



(Abstract) 



A correlation of recorded shocks with the known faults of the region, and 

 especially with those suspected to show recent activity. 



SECONDARY PSEUDOSTRATIFICATION IN SANTA BARBARA COUNTY, 



CALIFORNIA 



BY GEORGE D. LOUDERBACK 



(Abstract) 



There has developed in Tertiary friable massive sands an appearance of 

 beds and of stratification planes, caused by secondary agencies acting at or 

 near the surface. The appearance was described and illustrated and probable 

 causes discussed. 



3 Introduced by George D. LouderMck. 

 ' Introduced by George D. Louderback. 



