WABASH MORAINE. 561 



gravel. Wells on the moraine north of Unioudale strike rock at 50 to 70 

 feet. They are through till nearly the whole depth, but some of them pass 

 through thin beds of sand just above the rock. 



A well in Allen County, on the crest of the moraine, in sec. 17, T. 29, 

 R. 11 E., 102 feet in depth, does not reach the bottom of the drift; it is 

 mainly through till. A well one-half mile east, and perhaps 15 feet lower 

 at surface, penetrates 73 feet of till, beneath which is gravel which becomes 

 wate bearing at 85 feet from the surface. 



North of the old lake outlet in Allen County wells are oi-dinarily 

 obtained at 30 to 40 feet or less. They seldom penetrate much sand or 

 gravel. The yellow till is 10 to 20 feet thick, being shallowest beneath 

 level or low portions and deepest in the swells. It changes at these depths 

 to blue till. On the plain northwest of the moraine, near Dunfee station, 

 several wells are 60 feet and one 127 feet in depth. In all of them the. 

 greater part of the section is till, which is reported to be very hard and 

 dry and of a blue color from within 10 feet of the surface. Near Hunter- 

 town, in section 4, Perry Township, and on the plain just outside the 

 moraine, a boring for gas passed through 281 feet of drift. It penetrated 

 yellow and blue till to a depth of 20 feet, beneath which the section is 

 mainly sand and gravel. At Auburn and Butler gas wells penetrated 

 equally large amounts of drift, as reported above (p. 504). 



INNER BORDER PHENOMENA. 



In Adams, Wells, and southern Allen counties, Ind., and Mercer Countv, 

 Ohio, the moraine is bordered on the northeast by a nearly plane till tract,, 

 which has a gradual descent to St. Mar}'s River, while in Auglaize and 

 Allen counties, Ohio, there is a similar descent to Hog Creek. Between the 

 head of Hog Creek and the Sandusky River a plain extends northward 

 several miles, the Fort Wayne moraine being very weakly developed there; 

 but from Wyandot eastward^ as already noted, the Fort Wayne moraine is. 

 separated but a short distance from the inner border of the Wabash moraine. 



There are occasional swells 10 or 15 feet high on the inner border 

 plain, but nearly the whole of the surface is so flat that large open ditches; 

 have been made to carry off the surplus rainfall. A black soil 1 to 2 feet 

 or more thick covers the greater part of the plain, and beneath this is a 

 yellow clay, which contains fewer pebbles than are ordinarily found in the 



MON XLI 36 



