TITLES AND ABSTRACTS OF PAPERS /9 



ill connection with railway construction and the improvement of tlie roads of 

 the State. It is quite true that in some parts of Iowa the Kansan drift can 

 be distinguished readilj^ from the Nebraskan drift within the same area ; on 

 the other hand, there are other places in Iowa where the color, composition, 

 and other characters of the Kansan drift are so similar to the characters of 

 the Nebraskan drift that it is impossible to distinguish the two drifts by such 

 criteria. 



LOESS-DEPOSITiyb WIXD.S IN THE LOUISIANA REGION 

 BY F. V. EMERSON ^ 



{Abstract) 



The eolian origin of the southern loess is generally conceded by most workers 

 who have studied the formation within the last twenty years. It has long 

 been recognized that strong westerly winds have deposited the wide loess belt 

 along the eastern side of the Mississippi and the less frequent and persistent 

 easterl^^ winds have deposited the narrower, less continuous belt on the west- 

 ern side. The soils of the west belt contain considerably more potash than 

 those of the east belt. The explanation offered is that the finer loess particles 

 were carried to the west belt by the weaker easterly winds. Microscopic ex- 

 amination of Louisiana loess shows that the potash occurs in bits of ortho- 

 clase between 1/100 and 5/100 of a millimeter in diameter, and that practically 

 all particles larger than this are quartz. It is therefore thought that the 

 w^eaker easterly winds carried finer loads with a consequently higher percent- 

 age of orthoclase than the stronger westerly winds. 



There are two "islands" of loess nearly or quite surrounded by Mississippi 

 alluvium, and in each case the loess at the southern ends of these areas is 

 thicker than at the northern ends. This seems to indicate that southerly winds 

 (probably southwesterly and southeasterly) were important loess carriers in 

 this region. 



Read in full from mainiscri]:)t. 



STREAM MEANDERS 

 BY E. B. BRANSON 



(Abstract) 



Meanders are variously interpreted in recent text-books and articles. One 

 text states that meanders begin to develop after a stream has cut to l)aselevel, 

 while another states that they start in the early youth of a stream, lliis 

 article discusses the development of meanders in young valleys. 



Read by title, at the request of the author. 



Introduced by A. P. Brigham. 



