Browsing by Author "Runkel, A.C."

Now showing 1 - 20 of 29
  • Thumbnail Image
    Item
    Bedrock geologic map of Carver County, Minnesota
    (Minnesota Geological Survey, 1993) Runkel, A.C.
    Bedrock geologic map of Carver County with bedrock topography contours.
  • Thumbnail Image
    Item
    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
  • Thumbnail Image
    Item
    Bedrock geology of Houston County, Minnesota
    (Minnesota Geological Survey, 1996) Runkel, A.C.
  • Thumbnail Image
    Item
    C-14 Geologic atlas of Wabasha County, Minnesota [Part A]
    (Minnesota Geological Survey, 2001) Runkel, A.C.
  • Thumbnail Image
    Item
    C-24 Geologic Atlas of Sibley County, Minnesota [Part A]
    (Minnesota Geological Survey, 2011) Lusardi, B.A.; Runkel, A.C.; Meyer, G.N.
    Surface and subsurface geology of Sibley County
  • Thumbnail Image
    Item
    C-25 Geologic Atlas of Nicollet County, Minnesota [Part A]
    (Minnesota Geological Survey, 2012) Meyer, G.N.; Runkel, A.C.; Lusardi, B.A.
    Surface and Subsurface geology of Nicollet County, Mn.
  • Thumbnail Image
    Item
    C-26 Geologic Atlas of Blue Earth County, Minnesota [Part A]
    (Minnesota Geological Survey, 2011) Runkel, A.C.; Meyer, G.N.; Lusardi, B.A.
    Surface and subsurface geology of Blue Earth County, Mn.
  • Thumbnail Image
    Item
  • Thumbnail Image
    Item
    Geology in support of groundwater management for the northwestern Twin Cities Metropolitan area
    (University of Minnesota, 2003) Runkel, A.C.; Tipping, R.G.; Mossler, J.H.
    The Paleozoic bedrock in the northwest part of the Twin Cities Metropolitan area (Fig. 1) has been increasingly relied upon as a source of potable water. Most municipal wells in the area are now constructed to draw water from Paleozoic bedrock because productive drift aquifers are uncommon and are more susceptible to contamination. Increased reliance on Paleozoic strata as a source of groundwater led to a request by environmental managers, led by the Metropolitan Council, for improved geologic maps of the area as well as a hydrogeologic characterization of the most heavily used aquifers and their intervening confining units, those in the siliciclastic-dominated, Upper Cambrian part of the Paleozoic section. Hydrogeologic characterization combined with mapping provides a geologic framework for the northwest metro area that is of greater usefulness to environmental managers because it will increase the accuracy of groundwater protection plans, as well as predictions of aquifer productivity. Our hydrogeologic investigation is focussed on detailed characterization of the Upper Cambrian aquifer commonly referred to as the “Franconia-Ironton/Galesville” or “FIG” aquifer, using recently developed borehole geophysical techniques (Paillet and others 2000; Runkel and others, 2003). The tentative strategy for communities in the northwest metro area is to use the FIG aquifer as the principle source of potable water. Information was also collected and synthesized, to a lesser extent, on the Eau Claire and St Lawrence Formations, which are generally considered confining units above and below the FIG aquifer, and on the Mt Simon Sandstone, which is considered a less desirable alternative to the FIG as a source of water.
  • Thumbnail Image
    Item
    A Hydrogeologic and Mapping Investigation of the St. Lawrence Formation in the Twin Cities Metropolitan Area
    (University of Minnesota, 2006) Runkel, A.C.; Mossler, J.H.; Tipping, R.G.; Bauer, E.J.
    This report summarizes the results of a two year project conducted by the Minnesota Geological Survey to map the Upper Cambrian St. Lawrence Formation and investigate its hydrologic properties in the Twin Cities Metropolitan area (TCMA). Funding was provided by the Minnesota Department of Health. Final products are a map delivered in electronic format that can be used with Arcview 3.2 GIS software, and this informal report. Our hydrogeologic study indicates that the St. Lawrence Formation commonly has a moderate to high horizontal hydraulic conductivity across all of the study area. In conditions of shallow burial beneath younger bedrock it is most similar in the development of secondary pores and measured hydraulic properties to fractured carbonate rock aquifers. Discrete intervals with secondary pores have a high horizontal hydraulic conductivity whereas rock between these intervals are orders of magnitude lower in conductivity. The properties of the St. Lawrence Formation in a vertical direction are not as wellunderstood, but available data are consistent with the traditional classification of the formation as an aquitard. However, the integrity of the formation as an aquitard in a vertical direction, particularly under conditions of shallow burial such as where it is uppermost bedrock, has not been rigorously tested, and may be markedly variable across the TCMA. This is chiefly because vertical fractures play an important role in determining aquitard integrity, and the distribution of such fractures is poorly understood. Suggestions for additional research that might lead to a better understanding of aquitard integrity are made at the end of this report.
  • Thumbnail Image
    Item
    Hydrogeology of Scott County
    (Minnesota Geological Survey, 2008) Tipping, R.G.; Runkel, A.C.
    This report describes the hydrogeology of Scott County, based on the assembly of existing data and data acquired as part of this investigation. The focus of this report is on bedrock hydrogeology, with additional discussion of the hydrogeology of Quaternary unconsolidated deposits. The report is intended to supplement maps provided as part of the Scott County Geologic Atlas revision, produced with the support of the Scott County Board of Commisioners.
  • Thumbnail Image
    Item
    Hydrostratigraphic and hydraulic characterization of Paleozoic bedrock at nine southeastern Minnesota communities:research in support of wellhead protection
    (University of Minnesota, 2001) Runkel, A.C.; Mossler, J.H.
    This report summarizes research conducted by the Minnesota Geological Survey (MGS) for the Southeastern Minnesota Water Resources Board (SMWRB) to provide basic data and technical interpretations pertinent to the design of wellheadprotection strategies for nine communities in southeastern Minnesota (Fig. 1). The study focuses on the hydrogeologic attributes of Paleozoic bedrock that supplies these communities with potable water. The communities, including the cities of Brownsdale, Cannon Falls, Hayfield, Hokah, Kasson, Lewiston, Lonsdale, Plainview, and Preston, were selected by the SMWRB using criteria supplied by the Minnesota Department of Health (MDH). A brief addendum to this report also provides hydraulic conductivity estimates for the aquifers used by the cities of Eyota and Dodge Center.
  • Thumbnail Image
    Item
    M-080 Bedrock geologic map of northwestern Minnesota
    (Minnesota Geological Survey, 1994) Jirsa, M.A.; Runkel, A.C.; Chandler, V.W.
  • Thumbnail Image
    Item
    M-092 Bedrock geologic map of northwestern Minnesota.
    (Minnesota Geological Survey, 1999) Jirsa, M.A.; Chandler, V.W.; Runkel, A.C.
  • Thumbnail Image
    Item
    M-145 Bedrock geology of the Judson quadrangle, Blue Earth and Nicollet Counties, Minnesota
    (Minnesota Geological Survey, 2004) Runkel, A.C.; Mossler, J.H.
  • Thumbnail Image
    Item
    M-146 Bedrock geology of the Good Thunder quadrangle, Blue Earth County, Minnesota
    (Minnesota Geological Survey, 2004) Runkel, A.C.; Mossler, J.H.
  • Thumbnail Image
    Item
  • Thumbnail Image
    Item
  • Thumbnail Image
    Item
    Mapping and hydrogeologic research in support of groundwater management, Shakopee Mdewakanton Sioux Community, Scott County, Minnesota
    (University of Minnesota, 2008) Runkel, A.C.; Tipping, R.G.; Meyer, G.N.
    This report summarizes a project by the Minnesota Geological Survey (MGS) to conduct research intended to provide basic geologic data and technical interpretations pertinent to groundwater management strategies for the tribal land of the Shakopee-Mdewakanton Sioux Community (SMSC), and surrounding areas, in Scott County, Minnesota. The major project tasks included production of a number of maps, crosssections, and 3-dimensional images that depict Paleozoic bedrock and overlying Quaternary strata. An evaluation of the hydrogeologic attributes of the bedrock is also included, with emphasis on the Franconia Formation and Ironton-Galesville sandstones which are of increasing importance to the SMSC as a source of water.
  • Thumbnail Image
    Item
    Minnesota at a Glance Fossil Collecting in the Twin Cities Area.
    (Minnesota Geological Survey, 1995, 2018) Mossler, J.; Benson, S.; Runkel, A.C.;
    The Twin Cities is a major urban area hundreds of miles from the nearest ocean. It is, nevertheless, an excellent place to collect seashells. This is because the area was submerged by continental seas millions of years ago, and was inhabited by marine animals whose fossil shells remain in the bedrock of this area. This guide will help you find, identify, and understand some of these fossils. Keep in mind, this is meant to be only a brief overview of fossils in Minnesota. More complete fossil guides are available.