152 THE GLACIAL LAKE AGASSIZ. 



to north, is in the west part of township 131, range 57, close west of Har- 

 lem. Another, also trending with the meridian, lies 12 to 15 miles farther 

 north, between Marshall and Elliott, above which railway stations it rises 

 about 60 feet. The third is White Stone Hill, which extends about 4 miles 

 from east to west in the north part of township 132, range 56, having a 

 somewhat crescentric and oval form, convex to the south, with a height of 

 about 150 feet. None of these elevations consists of morainic drift, but 

 they seem to be due to the prominence of the underlying shale, which, 

 however, has no outcrops, the thickness and character of the drift being 

 neai'ly the same as on the surrounding intermorainic area. 



Multitudes of bowlders, mostly Archean gneiss and granite, seldom 

 exceeding 3 feet in diameter, are scattered on the g-ently undulating expanse 

 of till north of the Head of the Coteau. The bowlder-strewn tract extends 

 west to Belle Plaine and 2 or 3 miles west of Forman, and northward 

 through townships 130 and 131, in ranges 54 and 55, occupying an area 

 of about 150 square miles. The bowlders are fully fifty times more plen- 

 tiful than their average numbers on similarly smooth areas of till in western 

 Minnesota and North Dakota, their proportion being nearly the same as on 

 the morainic belts of this region. They may belong to morainic drift 

 which has been smoothed l)y a subsequent advance of the ice over it, hav- 

 ing been, perhaps, deposited during the time of the Kiester or Elysian 

 moraines, and covered by a glacial advance at the time of the Waconia 

 moraine; or they may have been gathered in iinusual numbers in the 

 englacial drift of this part of the ice-sheet, because of convergent curreiits 

 from the east and west, together with the influence of the highland so near 

 on the south. Further observations seem needed for determining satisfac- 

 torily the reasons for their abundance. They lie upon the central and 

 eastern part of the lacustrine area of Sargent Count}', unless that lake 

 became almost wholly drained away eastward, as is probable, Ijefore this 

 surface was uncovered from the ice. 



The Dovre moi-aine extends north from its liigh liills in the Fort Ran- 

 som Reservation and forms a belt of lower rolling and knoUy till, with 

 plentiful bowlders, through sections 34, 27, and 22, township 136, range 

 58. On each side it is bounded by flat tracts, about 50 feet lower than the 



