Red bricks of good quality have been made since 1876 by Ingersoll Brothers, near the centre of section 13, Otsego. Their product in 1880 was 115,000, and in 1881, 140,000, selling for $8 per thousand at the kiln. This clay, which needs no admixture of sand, is the two to four feet next to the surface upon small morainic hillocks of till. All of it is slightly gravelly, but far less so than is usual in this formation. The convent and schools at Saint Michael's were built of bricks from this place. (A Report on the Geological and Natural History Survey of Minnesota, 1882-1885, The Geology of Minnesota, Volume II, N. H. Winchell and Warren Upham, Pioneer Press Company, St. Paul, Minnesota, 1888, Page 261)
At Otsego (Wright County) an attempt to use the drift failed on account of the limestone contained. (Clays and Shales of Minnesota, Frank F. Grout and E. K. Soper, The University of Minnesota, Minneapolis, Minnesota, 1914, Page 170)