Open-File Reports

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Aggregate Resources Inventory of the Seven-County Metropolitan Area, Minnesota, St. Paul
(Minnesota Geological Survey, 1982) Meyer, G.N.; Jirsa, M.A.
Report and maps prepared for the Twin Cities Metropolitan Council detailing aggregate resources in the seven-county metropolitan area.
Bedrock and surficial geology of Hoyt Lakes-Kawishiwi area of the Duluth Complex, final report
(Minnesota Geological Survey, 1977) Weiblen, P.W.; Morey, G.B.; Cooper, R.W.
Bedrock geologic map of Carver County, Minnesota
(Minnesota Geological Survey, 1993) Runkel, A.C.
Bedrock geologic map of Carver County with bedrock topography contours.
Bedrock geologic map of east-central Minnesota
(University of Minnesota, 1995) Jirsa, M.A.; Chandler, V.W.; Cleland, J.M.; Meints, J.P.
Bedrock geologic maps, eastern half of Houston County, Minnesota
(Minnesota Geological Survey, 1995) Runkel, A.C.
Preliminary bedrock geologic map of the eastern part of Houston County, scale 1:100,000
Bedrock geology of Houston County, Minnesota
(Minnesota Geological Survey, 1996) Runkel, A.C.
Bedrock Geology of the Babbitt Northeast Quadrangle, St. Louis and Lake Counties, Minnesota
(University of Minnesota, 2002) Miller, James D., Jr.; Severson, M.J.; Foose, M.P.
Compilation Geologic Model for Cannon River Watershed: A Pilot Project
(Minnesota Geological Survey, 2022-07) Steenberg, Julia R; Retzler, Andrew J; Hamilton, Jacqueline D; Francis, Sarah W
This report is a summary of year one of a two-year pilot project conducted by the Minnesota Geological Survey for the Minnesota Department of Health Groundwater Restoration and Protection Strategies (GRAPS) program designed to support watershed planning efforts in the Cannon River Watershed. Our goal was to provide a compilation of both surface and subsurface geologic data within selected Board of Water and Soil Resources One Watershed One Plan boundaries in a format suitable for both modelers and the general public. Seamless geologic products provided within the watershed are based on a compilation of previously published MGS maps along with new mapping where necessary. Compilation methods and limitations associated with the subsurface modeling processes are described in the report. These products were transferred into web-based 3D models so they could be readily visualized and used outside of a GIS environment by water planners, other state agencies involved in the GRAPS process, and the public. The 3D model is available online at https://arcg.is/09OS1L0.
Compilation Geologic Model for Missouri River Watershed: A Pilot Project
(Minnesota Geological Survey, 2022-07) Steenberg, Julia R; Retzler, Andrew J; Hamilton, Jacqueline D; Francis, Sarah W
This report is a summary of year one of a two-year pilot project conducted by the Minnesota Geological Survey for the Minnesota Department of Health Groundwater Restoration and Protection Strategies (GRAPS) program designed to support watershed planning efforts in the Missouri River Watershed. Our goal was to provide a compilation of both surface and subsurface geologic data within selected Board of Water and Soil Resources One Watershed One Plan boundaries in a format suitable for both modelers and the general public. Seamless geologic products provided within the watershed are based on a compilation of previously published MGS maps along with new mapping where necessary. Compilation methods and limitations associated with the subsurface modeling processes are described in the report. These products were transferred into web-based 3D models so they could be readily visualized and used outside of a GIS environment by water planners, other state agencies involved in the GRAPS process, and the public. The 3D model is available online at https://arcg.is/1iimH50.
Compilation Geologic Model for Redeye River Watershed: A Pilot Project
(Minnesota Geological Survey, 2022-07) Steenberg, Julia R; Retzler, Andrew J; Hamilton, Jacqueline D; Francis, Sarah W
This report is a summary of year one of a two-year pilot project conducted by the Minnesota Geological Survey for the Minnesota Department of Health Groundwater Restoration and Protection Strategies (GRAPS) program designed to support watershed planning efforts in the Redeye River Watershed. Our goal was to provide a compilation of both surface and subsurface geologic data within selected Board of Water and Soil Resources One Watershed One Plan boundaries in a format suitable for both modelers and the general public. Seamless geologic products provided within the watershed are based on a compilation of previously published MGS maps along with new mapping where necessary. Compilation methods and limitations associated with the subsurface modeling processes are described in the report. These products were transferred into web-based 3D models so they could be readily visualized and used outside of a GIS environment by water planners, other state agencies involved in the GRAPS process, and the public. The 3D model is available online at https://arcg.is/15Gnz02.
Cu distribution in the South Kawishiwi intrusion of the Duluth Complex
(Minnesota Geological Survey, 1967) Wallen, D.A.
Data in support of surficial geologic mapping of the New Brighton Quadrangle
(Minnesota Geological Survey, 1964) Stone, J.E.
Digitization of geologic data from 1985-1993 COGEOMAP program area, Minnesota
(Minnesota Geological Survey, 1994) Miller, James D., Jr.; Wahl, T.E.; Bauer, E.J.
Duluth mapping project
(Minnesota Geological Survey, 1993) Miller, James D., Jr.; Green, J.C.; Chandler, V.W.
Erosional features, Cannon River Wilderness Park and surrounding areas
(Minnesota Geological Survey, 1980) Rohr, B.; Ratner, D.; Friedman, J.
Evaluation of catlinite resources, Pipestone National Monument, Minnesota
(Minnesota Geological Survey, 1981) Morey, G.B.
Field mapping in the Duluth Complex; Gabbro Lake quadrangle, Northern Minnesota
(Minnesota Geological Survey, 1974) Beltrame, R.J.
From Compass to Drone: The Evolving Role of Magnetics in Mapping the Geology and Ore Deposits Of the Lake Superior Region: 1830-2022
(Minnesota Geological Survey, 2022) Hinze, William J
The Lake Superior region, the “Birthplace of North American Precambrian Geology,” is noted for its world-class mineral resources, especially its native copper and iron ore deposits, and its classic bedrock of Archean and Proterozoic orogenic belts and the exposures of rocks of the Midcontinent Rift System. The magnetic method of mapping the region’s ore deposits and bedrock geology has been used for nearly two centuries because of limitations in the exposure of the Precambrian bedrock in the region. For the first century magnetic mapping was directed primarily at the identification of regions favorable for iron and copper ore deposits using simple magnetic needle instrumentation. Initially instrumentation was limited to the use of the dial (sun) compass and used mainly for exploration of hard, magnetite-rich iron ore deposits. With the introduction of the dip needle, a counterbalanced magnetic needle oscillating vertically in the magnetic meridian, to the Lake Superior region likely in 1865 by T.B. Brooks, magnetic mapping was no longer restricted to the difficult to interpret magnetic field angular variations.
Geologic descriptions of drill core from greenstone belt in northeastern Itasca County, Minnesota
(Minnesota Geological Survey, 1973) Himmelberg, G.R.
Geologic Investigation for Portion of the Twin Cities Metropolitan Area: Quaternary/Bedrock Hydraulic Conductivity and Groundwater Chemistry
(Minnesota Geological Survey, 2010-11-24) Tipping, Robert G; Runkel, Anthony C; Gonzalez, Christopher M
This report summarizes work performed by the Minnesota Geological Survey (MGS) in partial fulfillment of work as described under contract 091037 between the University of Minnesota and the Metropolitan Council. The goal of this investigation was to provide datasets that would assist the Metropolitan Council with regional ground water planning. Specifically, hydraulic conductivity data for both unconsolidated and bedrock materials, along with historic ground water chemical and isotopic data were assembled into spatial databases that can be used in a geographic information systems (GIS) format. Wherever possible, depth of the sampled or tested material was included along with location information, so the three-dimensional distribution of these data could be queried and compared to ongoing Metropolitan Council planning projects. For hydraulic conductivity data, the focus was on glacial-related Quaternary deposits, because these are the data most lacking for current ground-water modeling investigations. Hydrostratigraphic attributes of fine-grained materials were evaluated based on a comparison of measured values with texture, depth, and a literature review of other midcontinent tills. For water chemistry, the goal was to display the distribution of chemical types (hydrochemical facies) as a means to illustrate possible ground-water flowpaths. A sample acquisition date was included so the database could also be used to assess changes in chemical composition with time. For both hydraulic conductivity data and water chemistry, attributes were also assigned to a regional dataset of regularly spaced grid points to facilitate importing the data into groundwater modeling programs. The individual point data geodatabase (PointData.mdb) provides access to hydraulic conductivity and chemical data for a specific site. Because much of the site information on geologic setting comes from different consultant's reports, there is a lack of consistency in lithologic and stratigraphic attributes. In this way, PointData.mdb is best suited as a "what's in my neighborhood" type of dataset rather than for rigorous regional spatial analysis of hydraulic conductivity data. The grid design of regional summary data geodatabase (RegionalData.gdb) is meant to provide the means to readily import and adjust hydraulic conductivity and chemical data in ground water flow models, or for use as an additional layer for three-dimensional evaluation of model results. Use of regional summary data in these settings can aid in refining conceptual models of ground-water flow.