48 PROCEEDINGS OF THE WASHINGTON MEETING 



INTERMINGLING OF PLEISTOCENE FORMATIONS 

 BY B. SHIMEK 



LOESS A LITHOLOGICAL TERM 

 BY B. SHIMEK 



Professor Shimek's two papers were presented without notes. Dis- 

 cussed by W. C. Alden, F. V. Emerson, Frank Leverett, G. F. Wright, 

 with reply by the author. 



The Society adjourned at 12.25 o'clock p. ni. and reconvened at 2.03 

 o'clock. 



TITLES OF PAPERS AND NAMES OF DISPUTANTS^ 



The first feature of the afternoon session was a symposium on ancient 

 delta deposits, led by Messrs. Barrell, Grabau, and Branson. 



CRITERIA FOR THE RECOGNITION OF ANCIENT DELTA DEPOSITS 



BY JOSEPH BARBELL 



Presented in full without notes. 



ANCIENT DELTA DEPOSITS 

 BY A. W. GEABAU 



Presented in full without notes. 



MISSISSIPPIAN DELTA IN THE NORTHERN NEW RIVER DISTRICT OP 



VIRGINIA 



BY E. B. BRANSON^ 



Presented in full without notes. 



The three last-named papers were discussed by J. M. Clarke, David 

 White, G. W. Stose, Arthur Keith, G. I. Adams, E. T. Wherry, H. B. 

 Kiimmel, and W. C. Alden, with reply by Joseph Barrell and A. W. 

 Grabau. 



DIFFERENTIAL EROSION AND EQUIPLANATION IN PORTIONS OF YUKON AND 



ALASKA 



BY DE LORME D. CAIRNES' 



' Introduced by C. F. Marbut. 

 ^ Introduced by P. E. Raymond. 



