EVIDENCE THAT BEDS ARE AFTONIAN 133 



posed along the road for a distance of about 65 feet, and its upper line is 

 N-ery irregular, but sharply defined. The Aftonian, which lies uncon- 

 formably on it, has a very ferruginous band at its base.^^ 



(2.) The Aftonian is more or less variable in the distribution of its 

 materials. In some parts fine silt appears above, and the sand and gravel 

 are variously disposed. However, they show the characteristic structure 

 already noted and are typical. Large slabs or blocks of sand-conglomerate 

 are found in the sand beds. The measurements of the several parts of 

 this formation as given in the section are maxima. At no point do these 

 appear together, the total being about 20 feet. 



(3.) The exposed parts of the Kansan vary in thickness in the several 

 cuts from to 15 feet. None appears in the northern cut, the Loveland 

 resting directly on the Aftonian. 



The Kansan is separated from the Aftonian by a sharp lerruginous 

 line.i« 



(4.) The Loveland consists of typical reddish joint clay and varies 

 from 8 to more than 15 feet in thickness. 



The fossils were found in the layer of sandy silt, with the exception of 

 the fragments of Unio, which were collected in sand in the northern cut. 

 The list follows : 



(■nio , fragments. Phniorhis hicarinatus. 



Sphcerium sulcatum. PlanorMs dilatatus. 



Pisidium . Lymnma , probably L. caperata, fragments. 



14. Peyton pit}" — This sand pit is located in the northeast quarter of 

 section 23, township 81 north, range xliv west. The Aftonian here rises 

 about 40 feet above the Soldier Eiver bottoms and is at least 30 feet 

 thick. It is made up largely of sand, but with beds and wedges of gravel, 

 and it presents all the characters of typical Aftonian. 



Xear the base of the section a bed of white sand 6 to 8 feet thick ap- 

 pears, and just above it, in sand and gravel, a Sioux quartzite boulder 

 measuring 4 by 2 by II/2 feet was found. 



Mr. Peyton reports a dark-blue clay under the sand and gravel. This 

 is probably Nebraskan drift. 



The Kansan lies unconformably on the Aftonian, which it has evidently 

 plowed in its upper portions, and is very distinct. 



The following fossils were collected, the mammals in gravel and the 

 mollusks in sand: 



i» See Bull. Geological Society of America, volume 20, plate 34, figure 1. 

 i« See ibid., plate 34, figure 2. 

 I'' See ibid., plate 16. figure 2. 



