LOESS A LITHOLOGICAL TERM 739 



the loess is being transported to lower levels to be deposited along the flood- 

 plains of the present streams and largely into the ocean itself. Whatever 

 agency the wind may have had in distributing the loess, it was, in America, 

 glacial-laden streams which brought the material into the vicinity of the 

 present large deposits. 



Mr. Frank Leverett: Professor Shimek's suggestion that the name Sanga- 

 mon should be extended to the loess deposit that overlies the Sangamon soil 

 does not seem to me a step in the right direction. The Sangamon soil ap- 

 pears to have been developed under cool, and possibly humid, conditions which 

 followed somewhat closely the lllinoian stage of glaciation, and in which 

 decay of organic matter in the soil did not keei) pace with plant growth. At 

 that time there seems to have been relatively little dust in the air, or a con- 

 dition unfavorable for loess deposition. This in time gave place to a warmer 

 and probably less humid condition under which dust-laden winds transported 

 and deposited the loess. The earlier phase in which hunuis accumulates dom- 

 inated should be distinguished by a separate name from the later phase in 

 which loess deposition dominated. Certain Russian geologists have made a 

 clear separation of this sort and have named the earlier hunms-forming 

 phase the forest phase, and the later loess-depositing phase the steppe phase 

 of the interglacial stages. 



GROS VENTRE SLIDE 

 BY ELIOT BLACKWELDER 



{Abstract) 



In the Gros Ventre Valley of western Wyoming a part of the slope has been 

 quietly moving down toward the river for several years. In many respects the 

 operation is suggestive of glaciers. The slide was described, its history sum- 

 marized, and the geological conditions resijonsible for it were pointed out. 



CENOZOW HISTORY OF THE WIND RIVER MOUNTAINS, WYOMING 

 BY L. G. WESTGATE AND E. B. BRANSON 



(Abstract) 



A preliminary account of the successive peneplains, partial peneplains, and 

 terraces of the southeni part of the Wind River Mountains, the preglacial 

 gravels capping some of the terraces, and the relation of the terraces to de- 

 posits of an earlier and a later glaciation. 



STABILITY OF THE ATLANTIC COAST 

 BY DOUGLAS WILSON JOHNSON 



(Abstract) 



The results of the Shaler Memorial Investigation of shoreline changes along 

 the Atlantic coast indicate that there has been no appreciable subsidence of 



