The Loess of North America. [July, 



estuary or lacustrine deposit. The occurrence of Molluscan and Mammalian forms 

 is noted. Herein (p. 99) occurs the first mention of Unio in the loess, " in the banks 



his deposit. 



\V._ \gricultiirc ana G \j / Mi ,1 -if pi, pp. 194-197, 



HiLGARD, E. W.— The Loess of th Missi fi Valley uid 'he sE 'fan Hypothesis. 



This paper is the most elabarate review of Richthofen's hypothesis which has 

 come under notice. The author states that it was not his " intention, at this time, to 



formulate some of the more prominent objections lying y ,i„t the application of the 



me familiar." The author then proceeds to state Richthofen's objections, and to 



aqueous action are adduced ; and these are in turn succeeded by full notes of chemi- 



anomalous conditions required to sustain the seolian hypothesis, partakes strongly of 



the marvelous." 



H. H. HOWORTH.— Tratti of a Great Glacial Flood. Geological Magazine, Jan., 



Feb., 1882. 

 McGee, W. ].— Superficial Deposits in Northeastern Iowa. Proc. Am. Asso. for 



This author frequently mentions a " loessdike clay" of very variable tmckne^ 1" 

 this portion of Iowa. Reference is made to its physical characters which seem to 



than those surround ing. Its relation to the .ulna-en! dnft proper i> <]U>te liur * e< ' 



McGee, W. J.— The Surface Geology of a part of the Mississippi Valley. In t" e 

 Geological Magazine, August, 1S70. pp. 354~35 6 - 



like clay, unratified, free from gravel, sand and boulders." The auih " lL ^ _ 

 sence of stratification "except where it has been rearranged by fluvi 

 Numerous peculiar and anomalous fea ; ' lt waa 



