THE DES MOINES SECTlOlsr 



711 



half of which there are masses and layers of gray loess containing a few 

 broken fossil land shells. 



On the north side the yel- 

 low loess soon disappears, as 

 shown in figure 1 in the text, 

 but the mixed gray layer, 

 here distinctly folded, ex- 

 tends for about 50 feet to 

 the east. 



In this portion of the sec- 

 tion the lower 6 to 8 feet of 

 the Wisconsin also contains 

 masses of fossiliferous gray 

 loess. 



To the eastward, on the 

 north side, the section 

 shows a distinct stratum of 

 typical fossiliferous and ap- 

 parently undisturbed gray 

 loess, exposed for 50 feet to 

 a depth of 2 to 3 feet. 



A study of the entire sec- 

 tion, as shown in text figure 

 1, suggests that the Wiscon- 

 sin ice, moving in a south- 

 erly or southwesterly direc- 

 tion, somewhat as indicated 

 by the arrow, pushed the 

 mixed gray mass (b) from 

 its position above (d) and 

 deposited it above the yellow 

 loess (c), which was also 

 more or less disturbed, as 

 indicated by a lateral ex- 

 cavation westward, which 

 shows an irregular mass of 

 yellow loess lodged above 

 the mixed gray layer (6). 



THE SIOUX FALLS SECTION 



Location. — The Sioux 

 Falls section here discussed 



^^tD ^^Ui a r+ 











Th 

 he wes 

 •f gray 

 isting 

 d). ( 

 hells, 

 ts mat 









e line A 

 5t side. 



loess sii 

 chiefly o 

 c) Yello 



In (6> 

 erials ar 







fi 





-A repre 

 The dis 

 tnilar to 

 if gray h 

 w loess, 

 what is 

 e older t 





tp^^-^ 









S'f :.'■'-. 









j?g/ 







B^„ i? ■ <-^ M 





**''?/*' yJ» 



* 





p p 03 S-T^po a> 





^^^^'> 



\. 





P-BO^^BB 









^pg <I> Cfl 





' V* 



j> 







^ A 



r 





a •t ^ B^M _ 

 v--<t> < C O i-hrt; 





', r ■% 









J ^ 



? 





• B B-ri-B ri B- 



r+Cfl Boo 



!? 







nor 

 m A 

 etimi 

 more 

 .t fo 

 ly a 



o 



i''- 



•' ^ 





thwes 

 -A to 

 BS con 

 ! or l€ 

 ssilife 

 gray 





» 







s-sg^a,;; 



4 i^ 



J / 





> 



gg^oi-o 











o 



. - 







CO - B S' "^ 



<H. 



* • 







*" Xb h-D 



o 



^ 







O <<1 (I> OQ CO ft) 



» ^, 







< o 2 •-: 



\ 







n> C B 2"H, 



o 



'^ / 







f th 



out 



a.gm( 



ngle 



iger 



lies 



«. 



^ 



r 







rjH-agCTrt. 



«4. 









rt> p ^ CO g 



•*" 









'.? 







O Pfbrt) P 





- V 







^--^ <-K 











$^^^:4.s 



e 





n> 00 w^-o 



;s 



" ■-' '• ■!>* 







i-s ft CO a ts 



«+ 



^^Iv-^i^f 







the 1 

 Wis 



shells 



nsin 



d) G 



yellow 



o 



:;;:oAV^,i 







< i-j Ol- 2^ 



Co 



'*'■' 







P t? OP 



«+ 









„v- tr a <-! 











v.'O -^ B j^ 



b 

 2 



••••L.-V'o 







^' S P ® 





■"v.*',-.".t 







^^l>^^ 



fe; 



■'"V"^/' 







^ i, & 3 -• B* 

 - p ft •— - _^ 



o 



fer 







r+B O 2 2. 



2 



\- 







W B P C r+ 



^ 



\ 







being 



to 12 



lar m 



ning 



loess, 



seem 



1 



■ 

















the 

 feet 

 xed 

 oess 



und 

 ngly 



S 



J 







m JJO <-i O'O 











2 B oa p X's 





; 







2.ai°B„«, 





'', 







Wftg'lOBg' 





i 







and that to 

 aining mixed 

 to 4 feet thi 

 rived evident 

 intaining enti 

 the usual or( 





j 



V 



?^ 





- H-.„, p* 













• 















_o -t n 03 ^ 











2"ffi o o s » 





/ 







C OQ Q H n i-k 















