52 rROCEEDINGS OF THE CHICAGO MEETING 



Dr. E. M. BuRVVASH : I was interested in Mr. Johnston's new evidence as to 

 a mirror ice readvance at the close of the Yashon time. Two of his sections 

 have been excavated since my fieldwork was done. The third, near White 

 Rociv, I did not see. Apart from the data now adduced by Mr. .Johnston, there 

 is furtlier evidence for mirror ice readvanced on the Vancouver Island side of 

 the Gulf of Georgia. At Departure Bay a section examined by me in 1908 

 showed a lower till sheet overlain by well laminated clay which had been 

 planed off above by erosion. Above this were two, if not three, thin till sheets 

 separated by somewhat irregular water-laid deposits of sandy or gravelly type, 

 probably outwash in "some cases." ' 



SEDIMENTATION IN THE RECENT DELTA OF ERASER RIVER, BRITISH 

 COLUMBIA, CANADA 



BY W. A. JOHNSTON 



{Ahstract) 



A study was made during parts of 1919 and 1920 of the characteristics of 

 the lower part of Fraser River, British Columbia, and its delta. The investi- 

 gation included observations of currents, determinations of the amount and 

 character of sediment transported by the river, observations of water density 

 and temperature, character of river bottom and subaqueous delta materials, 

 and changes in the conditions of the river. 



The results of the investigation were briefly given, with particular reference 

 to the character and mode of deposition of the sediments as influenced by the 

 various currents and by the interaction of river water and sea-water. 



Read from manuscript. 



NOTES ON THE KENNECOTT GLACIER, ALASKA 

 BY ALAN M. BATEMAN 



(Abstract) 



The gathering grounds of the Kennecott glacier are in the Wrangel Moun- 

 tains, Alaska, at an elevation of over 16,000 feet. The glacier extends to an 

 elevation of 1,800 feet, where it has a width of five miles. Its rate of move- 

 ment at the margin and in the center was measured over a period of 374 days 

 and the data are presented. Disconnected observations are made in regard to 

 crevasses, disposition of morainal material, formation of esker-like lateral 

 moraines, subglacial streams, and apparent glacial overriding with coarse till, 

 now being deposited on top of finer water-sorted materials. 



Presented without notes. 



Discussion 



Prof. R. T. Chamberlin : I have been greatly interested in this welcome 

 paper on a glacier which has afforded such an excellent opportunity for the 



^ See "Contribntions to Canadian Biology, 1006-1010," quoting a paper by Lameplugh 

 in Geological Society, Edinbm-gh, which describes marine shells in the till excavated at 

 Esquimau dry-dock. 



