Plate 1, Data Base, Plate 2, Bedrock geology, Plate 3, Surficial geology, Plate 4 Quaternary stratigraphy, Plate 5 Bedrock topography, Depth-to-bedrock, and Sand distribution models, Scale 1:100,000. Plates have individual authorship.; Surface and subsurface geology of Clay County, Mn., also includes data-base information, subsurface stratigraphy, bedrock topography, depth-to-bedrock and sand distribution models.; The Clay County Board of Commissioners, and the Minnesota Environment and Natural Resources Trust Fund as Recommended by the Legislative-Citizen Commission on Minnesota Resources.