OUT WASH OF ILLINOIAN AGE. 291 



most of the time, except for the di-ift fiUing, and this was not sufficiently 

 high to gi-eatly impede the flow of water from the upper part of the Ohio 

 and its tributaries. The fiUing is generally below the 600-foot contour, 

 which is 100 feet lower than the head of the gravel terrace on the Scioto, 

 and perhaps 25 feet lower than the gravel filling near the mouth of the 

 Scioto. 



Below the limits of glaciation the Ohio Valley has received only a hasty 

 examination, and no deposits have been found that seem to be referable to 

 the lUinoian outwash. The examination has, however, not been sufficientlj- 

 complete to make certain that such deposits do not exist, and it is possible 

 that some terraces which have been referred provisionally to the Wisconsin 

 may prove to be older. 



