At Dayton, near the mouth of Crow River, laminated clays, which show the usual characteristics, have accumulated in great quantity. A brick yard owned by Mr. Prosper Vassar has exploited these clays since 1880, and has thus far used only the upper leached portion of the deposit. This has a few limey concretions, but has yielded excellent common brick for local use. At the brick yard, brick are molded with a stiff-mud machine, having a capacity of 30,000 brick per day. (Clays and Shales of Minnesota, Frank F. Grout and E. K. Soper, The University of Minnesota, Minneapolis, Minnesota, 1914, Page 170)