162 THE GLACIAL LAKE AGASSIZ. 



wide, is by estimate 75 feet. Theiice this plain of stratified drift extends 

 soutli along- tlie east side of the Sheyenne by Valley City and through 

 township 139, range 58, varying from 2 to 4 miles in width. In the west 

 half of section 25, township 142, range 58, a smaller swell or hill with such 

 smooth surface rises to nearly the same height, being likewise about 75 feet 

 above the plain of valley drift on the soutlieast and south. Against the 

 northeast edge of this smooth hill, the nucleus of Avhich is doubtless Creta- 

 ceous shale, there are piled typical morainic accumulations, 50 to 100 feet 

 high, whose very uneven contour and plentiful bowlders afford a remark- 

 able contrast. Another Cretaceous hill, called Pilot Mound, whose surface, 

 smoothly oval like a th-umlin, shows only the overlying till, rises in the 

 southeast quarter of section 2, township 141, range 57, to a height of 75 or 

 100 feet above the surrounding smooth expanse of till on all sides. The 

 base of this hill is about a third of a mile long from south to north, and its 

 width is about a quarter of a mile. Its sides and top have "somewhat more 

 plentiful bowlders than the adjoining country, but no morainic accumula- 

 tions were observed nearer than the Fergus Falls moraine, which lies 2 

 miles distant to the west. 



In the nortliAvest part of Steele County the Fergus Falls moraine 

 turns to a north-northwest course, which it holds along- an extent of about 

 25 miles to the southwest part of township 150, range 58, in Nelson 

 County, where it unites with the ninth or Leaf Hills moraine. In the 

 south edge of Nelson County the Fergus Falls moraine has a width of 

 about IJ miles, with its east boundary at the northeast corner of section 

 34, 3 miles east of Lee and the Sheyenne River. Its small knolls and 

 hillocks of till, with abundant bowlders, there rise 20 to 40 feet above the 

 intervening hollows and the adjoining surface, which is moderately undu- 

 lating till, with few bowlders, having a height of 175 to 200 feet above the 

 Sheyenne. 



Beyond township 150, range 58, the Fergus Falls and Leaf Hills 

 moraines are so indistinguishably combined in their prominent accumula- 

 tions south of Stump and Devils lakes, on the Big Butte, and northwest- 

 ward by Broken Bone Lake to the Turtle Mountain, that the two along this 

 extent of about 140 miles will be best considered together under the next 

 division of this subject. 



