

.!L' 



CHAPTER VII. 



BY M. W. HARRINGTON.* 



THE GEOLOGY OF OLMSTED COUNTY. 



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Situation and area. This large and wealthy county (plate 11) lies in 

 the second tier of counties north of Iowa, and is separated from the Missis- 

 sippi river by only Winona county on the east. Its form is nearly that of 

 a rectangle, with five ranges of townships east and west and four ranges 

 north and south. This geometrical figure is rendered irregular by Wa- 

 basha county which takes two townships from the northeast corner. This 

 irregularity is further increased by the addition of an east and west row 

 of twelve sections on the western part of the south side of the county, 

 which extend also half a mile farther west than the rest of the county. 



The land area of the various townships is given in the subjoined table 

 derived from the records in the office of the state auditor: 



*To the original survey and report of Prof. Harrington (fourth annual report) considerable new material has been 

 added. 



