534 THE GEOLOGY OF MINNESOTA. 



[Topography. 



but few powers that have been improved; though without doubt other parts 

 of Rock river have sufficient fall for mill purposes. The falls of Pipestone 

 creek near the Leaping Rock, are represented by figure 38. 



Water-power mills are found at two points in the Rock river valley, viz.: 



The Luverne mills, a quarter of a mile southeast of Luverne, owned by Allen & Webber. 



The fall here amounts to ten feet, and the mill has two run of stone. It is a grist and merchant 



mill. 



Tlie Ash Grove mills are in the southeast part of Clinton, about a mile north of the state 



line, owned by Mrs. Deborah Estey and son; fall seven feet; grist mill. 



PIPES TONE FALLS 



HO. 38. 



Topography. The contour of the immediate surface is caused by the 

 disposition of the drift, but the average elevation, throughout some broad 

 areas, is dependent on the underlying rock-strata. Pipestone county is 

 diversified in its eastern townships by long and broad swells running about 

 north and south, corresponding to the low water-sheds. The central part 

 of this county is a flat and monotonous prairie. The broad valley of Flan- 

 dreau creek with an elevation of about sixteen hundred feet crosses it diag- 

 onally in the northwestern corner, and the elevated crest of the Coteau des 

 Prairies cuts off diagonally its northeastern corner. The greatest uneven- 

 ness of surface, as well as the greatest elevation in these counties, is found 

 on this Coteau, the latter being somewhat over nineteen hundred feet 



