132 B. SHIMEK ^AFTONIAN FOSSILIFEROUS GRAVEL AND SAND BEDS 



10. Wilkenson well. — This is located in the northwest quarter of sec- 

 tion 6, township 85 north, range xlii west. Here, in a typical Kansan 

 drift region, a large tnsk (234), a molar, and fragments of cranial bones 

 (numbers 204-211) of Mammut americanum were found at a depth of 

 about 35 to 40 feet, in loose sand and gravel. This section is similar to 

 number (9). 



11. Hawthorn pit. — This is a sand and gravel pit in the same region, 

 being located in the northwest quarter of section 14, township 85 north, 

 range xliii west. 



The section is typical, showing loess, Loveland, Kansan drift, and 

 Aftonian, the latter here chiefly sand. Mr. C. A. Hawthorn discovered 

 bones in this at various times, but none were saved. 



12. McCleary pit. — This is also located in the same region, in the 

 southwest quarter of section 1, township 84 north, range xlii west. The 

 pit is remarkable because it is situated more than two miles inland from 

 the line of the Maple Eiver bluffs, on a small tributary creek. It shows 

 distinct plowing by the Kansan, which here lies distinctly above a stratum 

 of typical Aftonian sand, with some gravel, about 13 feet in depth. The 

 owner reported that in the gravelly portions of the pit he has found 

 "regular clam shells." 



13. County line exposure. — This is a section made by a road cut along 

 the Little Sioux Eiver, in the north half of section 5, township 81 north, 

 range xliv west, less than half a mile south of the Monona and Harrison 

 County line. The road is here about 25 feet above the Little Sioux Eiver 

 and parallel with it. Three cuts appear in close proximity, making an 

 almost continuous section more than 500 feet in length. The southern- 

 most of these cuts is the best and shows the following : 



5. Loess, appearing above the cut and ascending to top of bluff. 



4. Loveland, a reddish joint clay, with lines of very large calca- 

 reous nodules, more than 15 feet. 



3. Kansan, typical bluish, very calcareous till, 12 feet. 



2. Aftonian: 



Fine whitish silt, about 15 feet. 



Fine silt, mixed with sand, shell-bearing, 5 feet. 



Coarse gravel, very ferruginous, about 7 feet. This reaches 



10 feet in the northernmost cut. 

 Fine cross-bedded sand, 6 to 12 feet. 



1. Nebraskan drift, 10 feet exposed, but running out both ways. 



More detailed notes on the members of this section follow : 



(1.) The Nebraskan is typical blue-black till, breaking up into very 

 email blocks, and containing scattered pebbles and boulders. It is ex- 



