268 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



In northeastern Pike County, Ohio, in a tract known as the "Beech 

 Flats," records of several wells were obtained within a mile or two of the 

 limits of glaciation. These records show a heavy deposit of till. An old 

 valle}^ which drained that region northward to Paint Creek, as noted 

 on page 177, has been so completely filled that the drainage is now turned 

 southward through Brush Creek to the Ohio. The filling probably exceeds 

 300 feet in depth along the middle of the old valley. In a few places 

 along Brush Creek the drift becomes stony, but well-assorted, definitely 

 bedded gravel is rare. 



The knolls along Paint Creek Valley probably contain much gravel, 

 but it is not extensively opened. 



On the high terrace in the Scioto Valley east of Chillicothe several 

 wells have been sunk to a depth of over 100 feet, or to about low- water level 

 of the river, without striking rock. They are mainly through uncemented 

 sand and gravel. Occasionally thin beds of cemented gravel are passed 

 through. A well in section 26, Springfield Township, in process of excava- 

 tion at the time the writer was there, has the following section: 



Section of well near head of gravel terrace in sectiori 26, Springfield Toionship, Boss 



County, Ohio. 



Feet. 



1. Surface clay and fine sand 10 



2. Coarse sand and fine gravel 49 



3. Cemented gravel 11 



4. Fine calcareous saud with small amount of water 5 



Total - 75 



About 2 miles west of Mooresville, on the bluff of a small tributary of 

 the Scioto, exposures of blue till appear beneath a brown till. The blue till 

 is less thickly set with pebbles and coarse rock material than the brown. 

 West from this place around the base of ' ' Mount Logan " there is a very 

 stony, sandy till. 



In the valle}^ of Salt Creek east of Adelphi there is a calcareous blue 

 silt up to a height about 7.5 feet above creek level, which apparently was 

 deposited in a glacial lake held between the advancing ice front and the 

 divide across which Salt Creek was turned (see p. 178). This silt is cov- 

 ered with about 50 feet of coarse glacial drift, much of which is very 

 stony. Bowlders 1.^ to 2 feet in diameter are to be seen near Haynes, at 

 the extreme limits of the glacial drift. 



