THE IOWAN DRIFT SHEET. 135 



2 miles. It is interrupted by a narrow break in the west part of sec. 4, 

 through which a small stream passes. This paha is 30 to 45 feet in height 

 and 40 or 50 rods wide, including slopes. It presents the unusual feature of 

 carrying basins on its slopes. One near the line of sees. 4 and 5 contains a 

 pond with an area of about one-half acre. Another prominent ridge, appar- 

 ently a paha, is found at Round Grove, that village being situated near its 

 western end. The ridge is about l£ miles long, 30 to 40 rods wide, and 

 20 to 40 feet high. It is separated by only a narrow sag, scarcely wider 

 than the ridge, from an upland tract on the north which stands as high as 

 its crest, and it may possibly be only a detached portion of that upland. 

 It seems difficult, however, to account for a stream capable of causing its 

 separation from die upland, and that interpretation would not be thought of 

 if it stood like the paha last mentioned, some 3 miles from the upland. 

 Just north of the village of Spring Hill there is a paha nearly a mile in 

 length which rises about 20 feet above the general level of border districts 

 and has a width of only 20 to 30 rods, including slopes. Several paha 

 ridges appear on the low upland north of Green River in northwestern 

 Hemy County. The most prominent ones noted are a group of three 

 nearly parallel ridges crossed by the Geneseo and Sharon wagon road 3 or 

 4 miles north of Geneseo, in sec. 34, T. 18, R. 3 E. Their highest points 

 rise 40 to 45 feet above the bordering uplands, and they are each nearly a 

 mile in length. Shorter ridges of about the same height occur in sees. 31 

 and 32 of the same township and in sec. 4, T. 17, R. 2 E. 



There are in eastern Winnebago and Boone counties till ridges 

 elongated in an ENE.-WSW. direction, apparently the direction of ice 

 movement, which are drumlinoid in form. These ridges have been exam- 

 ined by Mr. I. M. Buell, in connection with his study of the drumlins of 

 eastern Wisconsin, and he considers them a phase of drumlin development, 

 though less perfect in form than the typical drumlin. These ridges usually 

 have a length of a mile or less and a breadth scarcely half as great as their 

 length. The higher ones rise 40 or 50 feet above border districts, but the 

 majority are 30 feet or less in height. With these drumlinoid ridges there 

 are associated knolls of nearly conical form, giving the surface a semi- 

 morainic aspect. No definite morainic belts, however, have been traced 

 across the district occupied by this ice sheet. The knolls appear in isolated 

 clusters surrounded by plane-surfaced tracts of greater extent. 



