594 TIIE GEOLOGY OF MINNESOTA. 



[Elevations. 



The elevation of the Minnesota river along the northeast side of Yellow Medicine county, 

 at ordinary low water, above which its highest floods rise 15 to 20 feet, is approximately as follows- 



Feet above 

 the sea. 



At the extreme northern point of Yellow Medicine county, opposite to Montevideo 



and the mouth of the Chippewa river 913 



Above Granite Falls ' 908 



Below Granite Falls 870 



Below Minnesota Falls 856 



At the mouth of Yellow Medicine river 848 



At the east line of this county 845 



The East branch of Lac qui Parle river crosses the north line of Yellow Medicine county at 

 an estimated hight of 1150 feet above the sea. From Alta Vista and Minneota the descent of 

 the Yellow Medicine river to its mouth is about 300 feet. At the east line of Lyon county the 

 elevations of the Redwood and Cotton wood rivers are about 1100 and 1120 feet, respectively, 

 above the sea. Lake Benton, at the source of the Bed wood river, is 650 feet higher, being 1754 

 feet above the sea, which is also approximately the altitude of lakes Shaokatan and Hendricks. 

 The general elevation of the Coteau des Prairies has been already stated. Its highest points in 

 this district, upon the outer terminal moraine, are from 1900 to 1975 feet above the sea, being the 

 highest land in southwestern Minnesota. From the west line of Lincoln county to the Head of 

 the Coteau, in Dakota, this moraine, lying upon or near the summit of the Coteau des Prairies, 

 has an elevation of 1900 to 2050 feet above the sea, or about a thousand feet above lakes Traverse 

 and Big Stone. This highland is very prominently seen in the view westward from the vicinity 

 of these lakes, and from central Yellow Medicine county, and less conspicuously from northern 

 and northeastern Lyon county. The inner moraine, situated on the eastern slope of the Coteau, 

 is in this district from 1500 to 1700 feet above the sea. 



Yellow Medicine county has a difference in elevation of about 900 feet 

 between its highest point, on or near the Dakota line, in the southwest 

 corner of the county, about 1750 feet above sea-level, and its lowest land, 

 the shore of the Minnesota river at its eastern boundary. The average 

 hights of the townships of this county are estimated as follows: Sioux 

 Agency, 1010 feet above the sea; Echo, 1050; Otis, 950; Minnesota Falls, 

 1000; Wood Lake, 1060; Posen, 1090; Stony Run, 1020; Hazel Run, 1060; 

 Sannes, 1075; Lisbon, 1075; Friendship, 1100; Normania, 1110; Tyro, 1130; 

 Swede Prairie, 1150; Omro, 1175; Burton, 1180; Oshkosh, 1220; Wergeland, 

 1240; Hammer, 1260; Norman, 1400; Florida, 1450; and Fortier, 1600. From 

 these figures the mean elevation of the whole county is found to be about 

 1165 feet. 



The highest land of Lyon county, in its southwest part, is about 1750 

 feet, and its lowest land, where the Redwood river crosses its east line, is 

 about 1100 feet above the sea-level. Estimates of the average elevation of 

 its townships are: Lucas, 1125 feet; Stanley, 1130; Clifton, 1160; Amiret, 

 1225; Monroe, 1400; Vallers, 1150; Fairview, 1175; Lake Marshall, 1200; 

 Sodus, 1300; Ouster, 1460; Westerheim, 1175; Grandview, 1200; Lynd, 1300: 

 Lyons, 1450; Rock Lake, 1560; Eidsvold, 1200; Nordland, 1350; Island Lake, 



