720 THE ILLINOIS GLACIAL LOBE. 



At the village of Baylis, situated on the crest of the highest drift ridge 

 in the county, a village well was sunk to a depth of 90 feet without enter- 

 ing rock. The upper 30 feet is of a clayey constitution, the remainder a 

 tine sand. Wells are obtained in this village at the top of this sand. In 

 ravines 1 to 2 miles southeast of Baylis there are exposures of drift about 

 50 feet in depth showing a brown surface clay with few pebbles, extending 

 to a depth of 30 or 40 feet, beneath which there is a pebbly brown clay, 

 streaked with gray, exposed to a depth of 10 or 20 feet. On the west slope 

 of the drift ridge, west and southwest from Baylis, the pebbly clay near the 

 base of the ridge is more gravelly than on the eastern slope, perhaps because 

 of the removal of the clayey material as an outwash from the ice sheet. 

 The section of a well at the residence of A. Hill, 2 miles north of Baylis, 

 appears on page 63. 



Along the county line northwest from Baylis the following section of 

 drift deposits was found: 



Section at roadside on county line northwest of Baylis, Illinois. 



Feet. 



Loess or yellow silt - " 



Ashy clay, probably soil 1_ 3 



Yellowish-gray clay with few pebbles 40-50 



Sand, gray or yellow, in thin beds 1- 2 



Ash-colored clayey sand, resembling soil 2- 5 



Cobble and gravel, with Canadian rocks - 5-15 



Total drift 60 " 85 



At New Salem a well near the railway station obtains water in a 

 gravelly clay at a depth of 30 feet, but in the main part of the village wells 

 usually enter rock at about 20 feet and obtain water at depths of 40 to 50 

 feet. 



In the vicinity of Griggsville the loess has a thickness of about 15 feet. 

 Beneath it is a brown clay in which there are but few pebbles and which 

 apparently extends to the rock. The village of Griggsville stands upon a 

 slight elevation in which rock is nearly at the surface, but on the bordering 

 plain rock is entered at greater depth, 25 to 35 feet. 



In the vicinity of Detroit and Milton rock is occasionally entered at 

 30 feet, but wells along the drift ridge west and south from these villages 

 are sunk to depths of 50 or 75 feet without entering the rock. A well at 

 Marion Petty's, south of Milton, is reported to have passed through a black 

 earth or soil containing wood at the base of the glacial drift, 30 to 35 feet 

 from the surface. 



