BLANCHAKD OR DEFIANCE MORAINE. 



Deep toells in Fulton County, Ohio — Continued. 



603 



A buried channel shown in the above table in a boring near Pettisville 

 in sec. 31, T. 7 N., R. 6 E. appears to lead eastward, passing about 1^ miles 

 south of Wauseon, where it is filled with 225 feet of drift, and thence north 

 of east. Its course was roughly determined by Orton for a distance of 

 about 9 miles by means of well borings, there being no surface indications 

 of its position.' Orton in the jDaper just cited also made the following state- 

 ment concerning the drift deposits near Wauseon: 



The uppermost 10 to 15 feet consists of yellow clay, oxidized. Below comes 

 blue claj^, often so charged with slate fragments and waste as to be almost black. 

 Thin seams of sand are irregularl}^ distributed through the mass. Large bowlders, 

 though rare, are not unknown. The boundary between the j^ellow and blue clays is 

 not sharp or well defined. The change in color simply marks the line to which the 

 surface water is able to descend. The blue clay reaches a general thickness of 130 to 

 150 feet. Below it about 5 feet of hardpan is found. This is here described as 

 cemented gravel. Under it a few inches of sand are usually found, and then the Ohio 

 shale is reached. 



Many of the Fulton County wells contain a small amount of inflam- 

 mable gas which is usually struck at the base of the drift. It is probably 

 derived from the underlying shale rather than from decomposition of organic 

 matter in the di-ift. The salinity of the water obtained in the Ohio shale is 



'Rock waters of Ohio, by Edward Orton: Nineteenth Ann. Bept. U.S. Geol. Survey. Part IV, 

 1899, p. 708. 



