Mossler, J.H.2010-03-312010-03-311983https://hdl.handle.net/11299/59986Scale 1:500,000, 8 pls. PLATES: 1, A. Maquoketa-Dubuque-Galena Formations, and B. Decora-Platteville-Glenwood formations; 2, A. St. Peter Sandstone, and B. Prarie du Chien Group; 3, Jordan Sandstone; 4, St. Lawrence and Franconia Formations; 5, Ironton and Galesville Sandstones; 6, Eau Claire Formation; 7, Mt. Simon and Hinckley Sandstones; 8, Pre-Hinckley bedrock surface.en-USMap