Cleland, Jane M.Meyer, Gary N.Mossler, John H.Swanson, LynnMap showing the thickness of unconsolidated materials (glacial and stream sediments) over the bedrock surface and the stratigraphy of the Quaternary materials, scale 1:48,000.PDFengMinnesota Geological SurveyPublicGeologic atlas of Ramsey County, Minnesota, C-7, Plate 5, Depth to BedrockMapsMinnesota1992University of Minnesota