WASHINGTON COUNTY, 1888. N. H. WINCHELL. 



and to the St. Croix valley.* The principal drainage into this glacial lake was from 

 a glacier loaded with gray till, since the country it included is now covered by a 

 pebbly, laminated clay, which in some places grades into gray till and in other 

 places is a fine gray clay. 



The quarries at Stillwater are the oldest in the Lower Magnesian formation in 

 the state, and furnish an excellent stone for all ordinary buildings and for bridge 

 arches and piers. N. H. w. 



*According to report there is such a valley, now abandoned, extending from Forest lake to Big Marine lake, but this has 

 not been verified. This glacial lake is the same as that already designated lake Mahtomedi in connection with the plate of 

 Ramsey county. 



