376 THE GLACIAL LAKE AGASSIZ. 



the Souris, occupying a width thiit varies from 1 to 5 miles. Their south- 

 ern limit is about 4 miles north of Holland, 3 miles north of Cypress River 

 station, and 2 miles north of Glenboro. One to 4 miles west of the mouth 

 of the Souris an isolated tract of dunes about 3 miles long from southeast 

 to northwest is crossed by Spring Creek near its mouth. North of the 

 Assiniboine much of its delta plateau is occupied by dunes, which extend 

 north to tlie White IMud River. Their most northern area is a belt that 

 reaches north of this stream through sections 12, 13, 24, and 25, township 

 15, range 15, to the junction of Hazel and Snake ci-eeks. But the north- 

 western part of this plateau includes a belt of smoi»th and fertile land, sev- 

 eral miles wide, extending from Carberry north and northwest to the limit 

 of the delta. Also, from Douglas and Chater southeastward a belt of good 

 agi'icultural land, free from dunes upon a A^'idth of 3 to 5 miles, reaches 15 

 miles along the northeast side of tlie Assiniboine. On the extreme western 

 and highest part of this delta conspicuoiis sand hills rise GO feet above the 

 adjoining surface, with their crests about 1,445 feet above the sea, in sec- 

 tions G and 7, township) 10, range 20, 2 to 3 miles southwest of Kemna}', 

 and lower hillocks of wind-blown sand continue from these 2 miles to the 

 southeast. 



Within G miles froni the dunes last noted, and from the boundary of 

 this Assiniboine delta, after crossing a belt of till that reaches aliout 3 miles 

 east and the same distance west from Alexander station, the Canadian 

 Pacific Railway, thence west to Griswold, Oak Lake, and Virden, lies upon 

 the delta ^A'hich was brought into the Lake Souris by the Assinilioine. In 

 townships 9 and 10, range 22, and township 9, range 23, including the 

 vicinity of Griswold, this deposit consists of fine clayey silt and sand, hav- 

 ing a moderately undulating or rolling surface, with broad, smooth swells 

 elevated 10 to 30 feet above the depressions, their tops being 1,400 to 1,435 

 feet above the sea. Three to 7 miles southwest of Griswold tliis delta has 

 been much channeled and uplifted by the wind in sand hills, which thence 

 continue 10 miles southeast along the north side of Plum Creek to section 

 11, township 8, range 22, 4 miles west of Plum Creek village. The crests of 

 these dunes are 1,420 to 1 ,430 feet above the sea, being 30 to 40 feet above the 

 adjoining surface. Nearl}' all of them are now covered l)y g-rass and bushes. 



