GENERAL FEATURES OF ILLINOIAN DRIFT SHEET. 273 



immediately below the blue till and a few feet above the rock. One of the 

 most striking instances, at ^Moimt Oreb, Ohio, and several in southeastern 

 Indiana, are cited in the well sections which follow. Orton has reported 

 the occurrence near Bethel, Ohio, of a soil and deposit of bog iron between 

 the yellow and blue tills, ^ it is said to be present over an area of several 

 square miles. Inasmuch as Orton was a careful and cautious observer, 

 the writer does not feel free to question the evidence he cites, but it is 

 apparently the only instance of a soil at that horizon yet reported. In 

 this connection it may be said that several instances of the "forest bed," 

 cited by Newberry in the Ohio reports and elsewhere, have been found to 

 refer simply to loose fragments of wood such as are now known to occur, 

 like bowlders, at all horizons in the till. This construction, however, may 

 not be applicable to the case under discussion. Orton reports the following 

 section of drift beds: 



Hepresentative sections of clr'/t ieds near Bethel, Ohio. 



[Reported by Dr. E. Orton.] 



Feet. 



Yellow clay, with' beds of sand and gravel 20 



Fine-grained clay free from grit 4 



"Forestbed" 2 



Bowlder clay 20-.30 



Upon visiting the region the writer learned through Dr. Abbott, of 

 Bethel, that several wells in the vicinity of that village have struck logs 

 and pieces of wood under the blue till in a gravelly bed that extends to 

 the rock, but nothing could be leai'ned of a buried soil in the midst of the 

 till. Rock is struck at 40 to 60 feet. 



The following notes upon the thickness and structure of the drift at 

 certain points may be of service in illustrating or in supplementing the 

 general statements made above: 



Near the bend of Brush Creek, a short distance north of Fort Hill, 

 in Highland County, there are deposits of till rising to a height of about 

 75 feet above the creek and extending to an undetermined distance 

 beneath the creek bed. The till contains not only pebbles, but also bowlders 

 of Canadian derivation, some of which are 2 feet or more in diameter. 

 The gi-eat thickness of till at this point may seem remarkable, since there 



iOp.cit.,p.443. 

 MON XLI 18 



