CHISAGO, ISANTI AND ANOKA COUNTIES, 1888. WARREN UPHAM. 



In Anoka county cream-colored brick are made from the laminated gray clays 

 derived from the gray till, and red pressed brick from the red clays of the earlier epoch.* 



The Keweenawan rocks appear in the valley of the St. Croix river at several 

 places, the most important being at the St. Croix dalles, in the interstate park, at 

 Taylor's Falls. The noncomformable overlying St. Croix sandstone is exposed on 

 section 4, Eushseba, forming a bluff fifty feet high and a quarter of a mile long. The 

 St. Lawrence limestone lies on the trap at Taylor's Falls. N. H. w. 



*A glacial lake which may be called lake Shafer covered the eastern part of Chisago county, extending fron Center City to 

 Taylor's Falls. 



