68 the eaised beaches of taltal. [feb. i907, 



Discussion. 



Dr. J. W. Evans welcomed a further contribution to our knowledge 

 of the elevation that had taken place in recent times on the western 

 coast of South America. The occurrence of the united valves of 

 lamellibranchs in raised beaches testified to the suddenness of the rise, 

 for they would have been at once severed if exposed to the powerful 

 Pacific surf. He himself had found Balani in raised beaches, in 

 Northern Peru, with all the plates in position. 



"With regard to the question of a recent period of greater rainfall 

 in Northern Chile, he suggested that torrential rains at long in- 

 tervals might account for the formation of the channels that the 

 Author had described. 



The Afthoe, in reply, thanked the President and Fellows for 

 their courteous reception of his paper, and the previous speaker for his 

 remarks upon it. The erosive action due to violent storms of rain 

 occurring at long intervals might certainly be very considerable in 

 beds of such friable material, and this would have to be taken into 

 account in attempting to determine the age of the raised beaches. 



