146 THE ILLINOIS GLACIAL LOBE. 



Iowan bowlders were found east as well as west of Goose Lake Channel, 

 as far north as the south edge of the belt of thick drift, but were not 

 observed farther north. The first night was spent at Bryant, near the north 

 edge of the belt of thick drift, and in the vicinity of this village a few 

 exposures of the drift were found at the base of the loess, all of which 

 showed a leached and reddened surface.. Continuing northward from 

 Bryant to Miles the loess was found to remain nearly as heavy as on the 

 belt of thick drift, but the glacial deposits were very much thinner and 

 seemed to be restricted to small bowlders and pebbles of crystalline pre- 

 Carubrian rocks. These were usually found embedded in a slightly dis- 

 turbed residuary clay of a deep reddish-brown color which can scarcely be 

 called till, the commingling of pebbles with residuary material being so 

 imperfect. Between Miles and Sterling the surface is ridged in a peculiar 

 manner, though somewhat similar to the paha of the neighboring- county on 

 the west (Jones County) in trend and form, the trend being WNW. to ESE. 

 and the form somewhat similar to an inverted canoe. The wells made on 

 these ridges were reported to have penetrated "clay and quicksand," and in 

 some cases have reached a depth of 40 feet without entering solid rock. As 

 no exposures were found, the precise nature of the deposits remain unde- 

 termined. A few granitic and greenstone pebbles were found in ravines 

 between Sterling and Sabula, showing that the glacial deposits occur a few 

 miles outside the limit mapped by McGree. 



Reviewing the above observations, it appears that nothing to suggest 

 the occurrence of Iowan drift was found along or north of the belt of 

 thickened drift except the paha-like ridges near Miles, and there the 

 resemblance is not known to carry with it the interpretation that they are 

 of similar origin or date to the paha of the clearly recognized Iowan drift. 

 At best the paha are still an enigma from which as yet nothing can be 

 proved. In view of the very thin and somewhat patchy development of 

 the Iowan drift near the terminus of the lobe in Ogle and Lee counties, 

 Illinois, some hesitancy is felt in declaring the Iowan drift to be absent from 

 northern Clinton and southern Jackson counties, Iowa. For in the latter 

 counties the heavy deposits of loess greatly interfere with the determination 

 of its extent, due occurrence of a sheet of drift markedly older than the 

 Iowan in the district mapped by McGee as occupied only by upper till is 

 abundantly evident. The thickened licit of this older drift merits further 



