McLEOD COUNTY, 1888. WARREN UPHAM. 



Here are several hundred feet of red shale and fragile red sandstone, showing 

 that it is not necessary to appeal to the region of lake Superior to account for the 

 red element in the till. This red shale and shaly sandstone was also encountered in 

 the deep wells at Belle Plaine, Mankato, Minneapolis, Hastings, and generally in the 

 central part of the state, having a great thickness. It is plainly a part of the con- 

 formable strata in the central part of the state lying below the Potsdam quartzyte, 

 and is perhaps the southern fragmental representative of the earlier (Cabotian) erup- 

 tives of the Keweenawan. N. H. w. 



