Browsing by Author "Mossler, J.H."
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Item C-08 Geologic atlas of Fillmore County, Minnesota [Parts A and C](Minnesota Geological Survey, 1995) Mossler, J.H.Item C-11 Geologic atlas of Mower County, Minnesota [Part A](Minnesota Geological Survey, 1998) Mossler, J.H.Item Geologic map of Minnesota, Roseau sheet, bedrock geology.(Minnesota Geological Survey, 1979) Ojakangas, R.W.; Mossler, J.H.; Morey, G.B.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.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.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.Item Information Circular 46. Aggregate Resources Inventory of the Seven-County Metropolitan Area, Minnesota(Minnesota Geological Survey, 2000) Southwick, D.L.; Jouseau, M.; Meyer, G.N.; Mossler, J.H.; Wahl, T.E.Construction aggregates are sand, gravel, and crushed rock-bulk granular materials that are used in building and landscaping projects of all sizes and kinds. Most of the highest quality aggregate is used in the manufacture of concrete and top-grade asphalt paving. Aggregates of lower quality are used as fill, base-course for roads, and for a myriad of other purposes. Aggregate quality is determined by the mechanical and chemical properties of the constituent rock particles. In very general terms, the best aggregates for high-end uses contain particles that are strong (resist abrasion and fracturing), chemically inert (do not decompose, swell, or shrink on exposure to air, moisture, or road chemicals; do not react adversely with cement materials), and are of optimum size and shape for the specific engineering requirements. High-strength concrete for heavy-duty use such as highways and airport runways requires aggregate composed of particles that are strong and inert, and also have broken faces; i.e. they are not round and smooth. This broken shape enables the particles to lock up mechanically with one another rather than roll under stress, and improves the durability of the paving. Construction aggregate producers and their largest customers in the construction sector have recognized for many years that the aggregate resources available for mining within the seven- county metropolitan area are rapidly diminishing. The ultimate reason for this is urbanization, which on the one hand increases the demand for construction aggregates, and on the other, tends to remove aggregate-bearing lands from production through land development and zoning decisions that preclude mining. When sources of aggregate are eliminated locally, and become more remote from places of need, the costs of construction rise significantly. This is mainly because of the increased cost associated with aggregate transportation. Cost increases are felt most acutely in large projects such as freeway or airport runway construction that require huge volumes of high-quality aggregate for concrete. Local decision-makers have become increasingly aware of aggregate-resource issues over the past few decades. Most counties and townships are substantial purchasers of aggregate materials for road building and other purposes, and are therefore sensitive to aggregate costs. Many are also involved in the controversies between neighbors and aggregate producers over the noise, dust, truck traffic, and other environmental impacts (real or perceived) associated with aggregate- mining operations. In Minnesota, including the seven-county metropolitan area, the powers to regulate aggregate mining and associated industrial operations reside largely at the county, city, and township level. Issues of land-use planning and regulation that apply to the construction aggregates industry need to be resolved. Government entities, the aggregate industry, and citizens of the seven-county metropolitan area all require dependable information on the physical distribution of aggregate resources and the probable economic lifespan of the local resource base. This report and the companion geological maps on which it is based (Meyer and MossIer, 1999) were prepared to meet that need.Item Karst hydrogeology of LeRoy Township, Mower County, Minnesota(Minnesota Geological Survey, 1997) Green, Jeffrey A.; Mossler, J.H.; Alexander, S.C.; Alexander, E.Calvin, Jr.Item M-051 Paleozoic lithostratigraphy of southeastern Minnesota(Minnesota Geological Survey, 1983) Mossler, J.H.Item M-052 Bedrock topography and isopachs of Cretaceous and Quaternary strata, east-central and southeastern Minnesota(Minnesota Geological Survey, 1983) Mossler, J.H.Item M-102 Primary sources of construction aggregate in the Twin Cities seven-county Metropolitan Area, Minnesota(Minnesota Geological Survey, 1999) Meyer, G.N.; Mossler, J.H.Item M-104 Bedrock geology and structure of the seven-county Twin Cities Metropolitan Area, Minnesota(Minnesota Geological Survey, 2000) Mossler, J.H.; Tipping, R.G.Item M-135 Bedrock geology of the Mankato West quadrangle, Blue Earth, Le Sueur, and Nicollet Counties, Minnesota(Minnesota Geological Survey, 2003) Mossler, J.H.Item M-136 Bedrock geology of the Mankato East quadrangle, Blue Earth, Le Sueur Counties, Minnesota(Minnesota Geological Survey, 2003) Mossler, J.H.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.Item M-146 Bedrock geology of the Good Thunder quadrangle, Blue Earth County, Minnesota(Minnesota Geological Survey, 2004) Runkel, A.C.; Mossler, J.H.Item M-153 Bedrock geology of the Stillwater quadrangle, Washington County, Minnesota(Minnesota Geological Survey, 2005) Mossler, J.H.Item M-154 Bedrock geology of the Hudson quadrangle, Washington County, Minnesota(Minnesota Geological Survey, 2005) Mossler, J.H.Item M-166 Bedrock geology of the Saint Paul Park quadrangle, Washington and Dakota Counties, Minnesota(Minnesota Geological Survey, 2006) Mossler, J.H.Item M-167 Bedrock geology of the Prescott quadrangle, Washington and Dakota Counties, Minnesota(Minnesota Geological Survey, 2006) Mossler, J.H.