318 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



the glacial drift has softened the outlines of this still rather broken region 

 by filling up its valleys. The list of borings begins at the northern end of 

 Mill Creek Valley, where it joins the Great Miami Valley, and includes a 

 few wells in the latter valley. 



At Hamilton a prospect boring for gas penetrated. 210 feet of drift, 

 which was nearly all gravel and sand, striking rock at an altitude of about 

 390 feet above tide, or 42 feet below low water in the Ohio at Cincinnati. 

 A well at Snyder's paper mill, in the eastern part of Hamilton, penetrated a 

 bed of bowlder clay beneath the gravel, as follows : 



Section, of xoell at Snyder's paper mill, Hamilton, Ohio. 



Feet. 



Gravel - - - - - - - - 80 



Bine bowlder clay - - - - 20 



Gravel - - - - - 20 



Total... - 120 



A well at the Franklin paper mill in the southern part of Hamilton 

 penetrated a blue, pebbleless clay near the bottom, as shown by the 

 following section: 



Section ofiuell at Franklin paper mill, Ham^ilton, Ohio. 



Feet. 



Cobble and gravel 25-30 



Fine gravel with some sand 50 



Blue clay without pebbles ■ 25 



Sand at bottom. 



Depth of well 102 



Wells in the Great Miami Valley 5 to 6 miles below Hamilton, near 

 the mouth of Indian Creek, strike a black muck under the gravels of the 

 glacial teiTace at a depth of 60 to 65 feet, the altitude at the well mouths 

 being about 40 feet above the river. This black muck probably separates 

 gravel of Wisconsin age from earlier deposits. 



The exposures in Mill Creek Valley, from the border of the gravel plain 

 on the Miami River near Hamilton to the border of the moraine near Read- 

 ing, are quite uniforml};- till, or deposits such as would be produced by 

 glacial action, and difPer markedly from the gravel deposits that follow 

 the Great Miami and Ohio rivers. Three miles southeast from Hamilton, in 

 the lowland tract near the canal, a gardener, Joseph Federlee, made a well 

 1 10 feet deep which did not strike rock. The drift consists mainly of a blue, 



