The Loess of North America. 



summits of kames. It formed the upper surface o 



\. S.— On the Surface Geology of the Great Lakes and the Valley oft 

 pi. Annals of the Lyceum of Nat. Hist, of New York, Vol. ix, r. 

 (1869); also in Am. Nat., Vol. IV, p. 193 (1871). 



scussion of the surface geology of the cent 



e Adirondacks and Alleghanies, and on the west by the Rocky mou 



The author describes it as " a lacustrine, non-glacial, drift deposit 

 n is noticed, and the manner of its deposition. 



3 DALE.— Report of a Geological Survey of Wisconsin, Iowa ami Mi, 

 nd incidentally of a portion of Xcl<raska Territory (1852). 

 133 and 135-131. of this valuable report contain some of the earlie 

 a with reference to the loess deposits of Iowa and Missouri. Tl 



mono,! «, 1. 



r liana occularia (quere occulta), Succinea ca 



mfestris ? and /' 



Ufa armif 



era. The < 



generally accepted theory of lacu'strine origin 



is alluded to, ar 



id an iilus- 





hills of silicious marl, below Council Bluffs 









:um as it occurs at St. Joseph, in Missouri, is 



noted, and the s; 





are quoted with th< dition of Helix fratertia. Dr. 





these de- 



posits and tl 



rose of the Wabash equivalent. 







Owen, Da\ 



'ID DALE.— Geological Survey of Kentucky, pp. 1 7-22, 27-29 



(1S56). 











earth of pal 



e reddish-gray or ashen flesh tint." He stat. 













nominated 



through the 



formation. The following genera are indicated: Helix, He 



licina, Cy- 





lecinea, Pupa, Cyclas, Planorbis and Lymnae 



a. In accountii 



ig for the 





concretions, found in considerable abundai 







"forme! bv 



the percolation of water charged with carbo 



nic'acid, which, 



dissolving 



the calcareo 



us matter in the upper part of the deposit, a 



L rries it by libra 



tion to the 







masses." He j 





scription of 



the physical geography at the period when th 



esc beds were fo 



'rmed. 



^ZTa'o 



R.— The Relation of Secular Rock-duintcgrai 

 ck Basins. Am. Jour, of Sci. and Arts, Vol. 



•iom to Loess, Cl< 



uial Drift 



This pape 



r was originally read before the National A 



cademy of Sciei 



ices. April 



1 Richthofen's hypothesi; 



) China fails in An 

 33-434 (1S69). 



