6 pls. Scale 1:100,000. Pl. 1, data-base; pl. 2, bedrock geology; pl. 3, surficial geology; pl. 4, depth to the pre-Cretaceous bedrock surface and topography of the pre-Cretaceous bedrock surface; pl. 5, subsurface stratigraphy; pl. 6, sand and gravel resources and bedrock resources. See also RI-50. Part B Published separately by the Minnesota Department of Natural Resources, Division of Waters. Supplementary files include ESRI GIS coverages pertaining to the geology plates and metadata.