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- Geology (15)
- Geology--Minnesota (8)
- Glaciology (5)
- Cannon River (Minn.) (2)
- Drift (2)
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- Festschriften (2)
- Geology, Stratigraphic--Pleistocene (2)
- Groundwater--Minnesota (2)
- Hydrology (2)
- Iron ranges--Minnesota (2)
- Lakes & ponds--Minnesota (2)
- Minnesota River Valley (S.D. and Minn.) (2)
- Shields (Geology) (2)
- Winchell, N. H. (Newton Horace), 1839-1914. (2)
- Agriculture (1)
- Alaska (1)
- Aquifers (1)
- Archaeology (1)
- Archaeology--Methodology (1)
- Artesian wells (1)
- Belle Plaine (Minn.) (1)
- Climate--Minnesota (1)
- Copper mines and mining (1)
- Copper mines and mining--Minnesota (1)
- Excavations (Archaeology)--Minnesota (1)
- Forests and forestry (1)
- Fossils (1)
- Gas wells--Minnesota (1)
- Geographic information systems (1)
- Geography--Minnesota (1)
Articles 1 - 30 of 57
Full-Text Articles in Physical Sciences and Mathematics
Analysis Of Hydrogeologic Sensitivity In Winona County, Minnesota, Michael D. Trojan, James A. Perry
Analysis Of Hydrogeologic Sensitivity In Winona County, Minnesota, Michael D. Trojan, James A. Perry
Journal of the Minnesota Academy of Science
Hydrogeologic sensitivity to contamination throughout Winona County in southeastern Minnesota was assessed using the recently developed Trojan-Perry rating method. Sensitivity varied across and within three analysis regions. The Prairie du Chien Aquifer, comprising Region I, showed a wide range of sensitivity, varying from moderate to extreme. Areas of greatest sensitivity were sites where the aquifer was unconfined and overlain by a thin layer of unconsolidated material and karst bedrock. Under these conditions water may rapidly infiltrate through the soil zone and highly dissolved bedrock and into underlying aquifers. The Ironton-Galesville Aquifer, comprising Region II, was protected from surface infiltration by …
Geographic Information Systems, Data, And Water Resources, Dwight A. Brown, Philip J. Gersmehl
Geographic Information Systems, Data, And Water Resources, Dwight A. Brown, Philip J. Gersmehl
Journal of the Minnesota Academy of Science
ABSTRACT-We evaluate three data handling methods for use in a GIS analysis of land-cover change impacts on runoff. A universe of 2560 point samples is analyzed to provide runoff calculations that would se1:7e _as a comparison base to evaluate different attribute logic systems. The attribute logics ~e evaluate are two va~1at1ons of tag and one of count. We chose a two by five mile area of Dakota County, Mmnesota as the test site, and prepared raster GIS maps of soil hydrologic groups and two plausible land covers. The count 1:1~thod for handling the generalization of data produced results that were …
Landscape Assessment Of Soil Erosion And Nonpoint Source Pollution, Ian D. Moore, John L. Nieber
Landscape Assessment Of Soil Erosion And Nonpoint Source Pollution, Ian D. Moore, John L. Nieber
Journal of the Minnesota Academy of Science
ABSTRACT-The hydrologic processes occurring in the landscape are a manifestation of its topographic attributes. Spatially variable topographic-based attributes permit the distribution of hydrologic and nonpoint source pollution processes to be mapped within catchments. They can be derived from Digital Elevation Models (DEMs) using a variety of Terrain Analysis Methods (TAMs). The relationships between topographic indices and the spatial distribution of the potential for surface runoff, groundwater recharge, soil erosion, and evapotranspiration are graphically illustrated.
Water Quality In Southeastern Minnesota Streams: Observations Along A Gradient Of Land Use And Geology, Nels H. Troelstrup Jr., James A. Perry
Water Quality In Southeastern Minnesota Streams: Observations Along A Gradient Of Land Use And Geology, Nels H. Troelstrup Jr., James A. Perry
Journal of the Minnesota Academy of Science
ABSTRACT-Surface water quality in southeastern Minnesota's driftless area exhibits subregional and local spatial patterns which are highly correlated with subsurface geology and land-use practices. Some variables appear to respond on subregional or watershed scales. Nitrate, specific conductance, alkalinity, and surface water atrazine concentrations were lower in streams originating from the Prairie Du Chien or Jordan sandstone ~quifers of easte:n Fillmore and Houston Counties than those originating from the Galena limestone aquifer m west-central Fillmore County. In addition, the numbers of pollution intolerant and functionally specialized invertebrates in the benthic community were higher in the eastern streams. Gross primary production on …
Origin And Developmental History Of Minnesota Lakes, H. E. Wright Jr.
Origin And Developmental History Of Minnesota Lakes, H. E. Wright Jr.
Journal of the Minnesota Academy of Science
ABSTRACT-Most lakes in Minnesota owe their origin directly or indirectly to glacial deposition or erosion 10,000 to 20,000 years ago. The lakes' shapes have since been modified by waves and currents near the shores and by the deposition of sediment off-shore-principally the sediment produced by growth of algae and other organisms. This sediment is a receptacle for pollen grains blown into the lake from the surrounding vegetation, and the stratigraphic succession of pollen grains records the postglacial vegetational and thus climatic history of the area. The sediment also preserves the fossils of microorganisms that reveal by their chemical composition the …
Natural And Anthropogenic Forces Acting On A Forest Lake, M. C. Whiteside, M. B. King, K. Pulling
Natural And Anthropogenic Forces Acting On A Forest Lake, M. C. Whiteside, M. B. King, K. Pulling
Journal of the Minnesota Academy of Science
ABS1RACT-Lak~ Itasca, Minnes~ta is located within one of the more popular state parks. Since the turn of the centmy, loggmg, fire protection, and development within the watershed have put modest pressures on the ecosystem. The presence of the University of Minnesota's Biological and Forestry Station on the lake has encouraged research in this region. Consequently there are numerous research reports and papers which are available _at the station's library. We examined data collected over the past 25 years to see if we could detect changes ~~ the lake. We detected no changes in phytoplankton, macrophyte, zooplankton, or zoobenthos com~urnues, but …
Residence Times Of Minnesota Groundwaters, Scott C. Alexander, E. Calvin Alexander Jr.
Residence Times Of Minnesota Groundwaters, Scott C. Alexander, E. Calvin Alexander Jr.
Journal of the Minnesota Academy of Science
ABSTRACT-Tritium, 14C, and nitrate analyses for eighty groundwater samples from selected Minnesota aquifers indicate a range of residence times from a few days or weeks to tens of thousands of years. The presence of significant nitrate contamination in groundwater is confined to recent or mixed groundwaters. Isotopic studies can yield information that will be useful in the design of effective groundwater protection plans in Minnesota.
A Hydrologic Model For Minnesota Peatlands, Kenneth N. Brooks, Dawn R. Kreft
A Hydrologic Model For Minnesota Peatlands, Kenneth N. Brooks, Dawn R. Kreft
Journal of the Minnesota Academy of Science
ABSTRACT-The Peatland Hydrologic Impact Model (PHIM) is a continuous simulation computer model developed over a twelve-year period to aid hydrologists in understanding the hydrologic functions of peatlands and upland-peatland watersheds. An initial conceptual model defined the research needed to create the working m?del. The re~e_arch has become an iterative process of model design, field work, model refinement, ~ode! test1?g, an~ add1t1?nal field work. The model is as physically-based as possible while relying on data mput that 1s readily available to the natural resources community. It simulates streamflow response of peatlands, upland-peatland systems, mined peatlands, and a combination of these watershed …
Human Impacts To Minnesota Wetlands, Carol A. Johnston
Human Impacts To Minnesota Wetlands, Carol A. Johnston
Journal of the Minnesota Academy of Science
ABSTRACT-Minnesota's 3.6 million ha of wetlands have been impacted by a variety of human activities, including agricultural drainage, urbanization, water control, and nonpoint source pollution. More than half of Minnesota's wetlands have been destroyed since the first European settlers arrived, an average loss of about 35,600 ha/yr. Drainage for agriculture is the major cause of wetland loss in Minnesota, particularly in southern Minnesota and the Red River Valley. In addition to impacting wetlands directly, wetland drainage affects downstream areas by increasing flood flows, and releasing sediment and nutrients. Urban development and highway construction affect a smaller proportion of Minnesota's wetlands, …
Geological Review Of Department Of Energy Proposed Sites In Minnesota For High-Level Radioactive Waste Disposal, Brenda Lorinser
Geological Review Of Department Of Energy Proposed Sites In Minnesota For High-Level Radioactive Waste Disposal, Brenda Lorinser
Journal of the Minnesota Academy of Science
The Department of Energy (DOE) proposed three potentially acceptable sites for high-level radioactive waste disposal in Minnesota. These sites were chosen on the basis of the nature of the exposed or near surface crystalline rock bodies they contain. However, the accuracy of the data used by the DOE in choosing these sites is variable, from excellent to poor.
Identification And Characterization Of Three Glacial Tills In Kandiyohi County, Minnesota, Allan G. Giencke, Richard O. Paulson, James R. Crum
Identification And Characterization Of Three Glacial Tills In Kandiyohi County, Minnesota, Allan G. Giencke, Richard O. Paulson, James R. Crum
Journal of the Minnesota Academy of Science
During the course of the Kandiyohi Co., Minnesota, soil survey, three different glacial tills were recognized and separated from what was formerly thought to be one homogeneous glacial till. Tile first glacial till is from the Des Moines Lobe ice advance. It has a fine-loamy particle size, friable consistency, and appreciable amounts of Cretaceous shale fragments. The oven-dry bulk density ranges from 1.3 to 1.5 glee. The second glacial till is from the Wadena Lobe ice advance. It has a coarse-loamy particle size, friable consistency, oven-dry bulk density of 1.5 to 1.7 glee, and small amounts of Cretaceous shale fragments. …
Drainage Basin Characteristics Of The Minnesota River, Paul Fasching
Drainage Basin Characteristics Of The Minnesota River, Paul Fasching
Journal of the Minnesota Academy of Science
The geomorphology of the Minnesota River Basin is poorly understood, yet much of modern fluvial ecology requires this information as a prerequisite to physical, chemical, or biological studies. The purpose of this paper is to provide background descriptive geomorphological river basin data for the Minnesota River. Eleven descriptive parameters (river gradient, Form f, Shape 1, Shape 2, circularity ratio, elongation ration, stream order, bifurcation ratio, average area by order, number of lakes per order and number of lower order streams entering higher streams) were determined for the Minnesota River Basin as a whole as well as for ten subbasins. A …
Buried Bedrock Topography Of The Cannon River System Around Northfield, Minnesota, Timothy D. Vick, Clinton A. Cowan, Daniel J. Packer
Buried Bedrock Topography Of The Cannon River System Around Northfield, Minnesota, Timothy D. Vick, Clinton A. Cowan, Daniel J. Packer
Journal of the Minnesota Academy of Science
A geophysical survey in the area of Northfield, Minnesota, involving electrical earth resistivity profiling and seismic refraction soundings, showed sizeable buried river channels in the bedrock in the Cannon River Valley which greatly increase in size downstream of Northfield. The channels upstream from the Northfield appear to be continuous and connect with the large buried channel between Northfield and Cannon Falls. The major buried valley deviates from the modern course of the Cannon River within the City of Northfield, but appears to follow elsewhere.
Glacial Drift Stratigraphy: New London-Spicer Area, Minnesota, D. B. Anderson, L. G. Soroka
Glacial Drift Stratigraphy: New London-Spicer Area, Minnesota, D. B. Anderson, L. G. Soroka
Journal of the Minnesota Academy of Science
No abstract provided.
Seismic Survey Of Buried Bedrock Topography In The Cannon River Valley, Timothy D. Vick, Glenn Greilich, Geoffrey O. Seltzer
Seismic Survey Of Buried Bedrock Topography In The Cannon River Valley, Timothy D. Vick, Glenn Greilich, Geoffrey O. Seltzer
Journal of the Minnesota Academy of Science
A seismic survey of the Cannon River Valley between Northfield and Cannon Falls, Minnesota, revealed the presence of a 30-meter deep buried river valley under or near the Cannon River. The buried channel emanates from the Spring Creek Valley in Northfield, makes a 90-degree turn to the northeast at the confluence of Spring Creek and the Cannon River. and follows the Cannon to Cannon Falls. Buried tributary valleys appear to join the main buried channel at several locations. There may be buried tributary valleys or a network of abandoned Cannon River channels eroded into bedrock under the lake plain north …
Minnesotans In Nature: Trends And Prospects, John R. Borchert
Minnesotans In Nature: Trends And Prospects, John R. Borchert
Journal of the Minnesota Academy of Science
No abstract provided.
Analysis Of Unmodified Stone Materials From The Cambria Site, Charles R. Watrall
Analysis Of Unmodified Stone Materials From The Cambria Site, Charles R. Watrall
Journal of the Minnesota Academy of Science
Analysis of the stone materials from the Cambria Site reinforces cultural implications about the site made on formal artifact analysis alone. Secondly, the paper illustrates a simple means of analysis to gain vital information on archaeological site culture history.
Precambrian Geology In Humboldt Township, Marquette County, Michigan, Peter D. Rowley
Precambrian Geology In Humboldt Township, Marquette County, Michigan, Peter D. Rowley
Journal of the Minnesota Academy of Science
ABSTRACT-The present study involved investigation of gneissic granite, migmatite, basic dikes, and faults in part of the Southern Complex of Michig.an. The average strike of the foliation of the gneissic granite based upon the orientation of feldspar phenocrysts is N. 60° w·;, the strike of the major dike set is between N. 30° W. and N. 60° W., the average strike of the fault zones-is N. 52° W., and a two-mile long body of migmatite trends about N. 57° W. The known history starts in the early Precambrian, when gneissic granite was emplaced and formed migmatites by incorporation of wall-rock …
Marine Geology, Preston E. Cloud Jr.
Marine Geology, Preston E. Cloud Jr.
Journal of the Minnesota Academy of Science
Were the average temperature of the earth a few tens of degrees less than it is, ice would be the most common crustal rock. The fact that it occurs in its liquid phase over 71 per cent of the earth's surface should not obscure the fact that the oceans are geologic features, particularly in their substructure, their boundary relations, and their history.
Variation In Perthitic Microcline From A Zoned Pegmatite, Terry E. Tullis
Variation In Perthitic Microcline From A Zoned Pegmatite, Terry E. Tullis
Journal of the Minnesota Academy of Science
Quantitative microscopic and chemical anaylses of 12 specimens of microcline, most of them perthitic, from the zoned Hugo pegmatite in the Black Hills near Keystone, South Dakota, have yielded data that can be used to estimate the temperatures of crystallization at successive stages in the formation of the pegmatite. The determined temperatures of crystallization range from 565°C in zone 3a, near the margin of the pegmatite, to 280°C in zone 7, the core.
A Geologic And Gravity Survey Of The Belle Plaine Area, Minnesota, R. E. Sloan, Z. F. Danes
A Geologic And Gravity Survey Of The Belle Plaine Area, Minnesota, R. E. Sloan, Z. F. Danes
Journal of the Minnesota Academy of Science
Combined geologic and gravity investigations in the vicinity of Belle Plaine, in the Minnesota River valley, have disclosed a hitherto unknown fault of possible major significance. The fault is inferred on the basis of available evidence to have a left lateral displacement of the order of 100 miles and later vertical movements of about 1,000 feet. The field work was supported by the Minnesota Geological Survey. The writers wish to express their great appreciation to the late Dr. Edward Thiel of the Department of Geophysics and to Dr. J. C. Craddock and Barton Gross of the Department of Geology, University …
Porosity-Permeability Characteristics Of Dedimentary Rocks, W. D. Lacabanne
Porosity-Permeability Characteristics Of Dedimentary Rocks, W. D. Lacabanne
Journal of the Minnesota Academy of Science
No abstract provided.
Geology At The Secondary School Level, William C. Scott
Geology At The Secondary School Level, William C. Scott
Journal of the Minnesota Academy of Science
No abstract provided.
The Effect Of Land Reduction On Sea Level And Continental Area, Fred Boos Jr.
The Effect Of Land Reduction On Sea Level And Continental Area, Fred Boos Jr.
Journal of the Minnesota Academy of Science
No abstract provided.
Geologic Dating And The Time Scale Of The Ice Age, H. E. Wright Jr.
Geologic Dating And The Time Scale Of The Ice Age, H. E. Wright Jr.
Journal of the Minnesota Academy of Science
No abstract provided.
Some Pleistocene Mammalian Inhabitants Of Minnesota, Clinton R. Stauffer
Some Pleistocene Mammalian Inhabitants Of Minnesota, Clinton R. Stauffer
Journal of the Minnesota Academy of Science
No abstract provided.
Newly Discovered, Non-Metallic Mineral Deposits Of Economic Value In Minnesota, George A. Thiel
Newly Discovered, Non-Metallic Mineral Deposits Of Economic Value In Minnesota, George A. Thiel
Journal of the Minnesota Academy of Science
No abstract provided.
Structural Geology At Llallagua, Bolivia, Lowell Moon
Structural Geology At Llallagua, Bolivia, Lowell Moon
Journal of the Minnesota Academy of Science
No abstract provided.
Application Of Reflection Seismic Prospecting To Outlining Of Oil-Bearing Geological Structures, George Welch, W. W. Wetzel
Application Of Reflection Seismic Prospecting To Outlining Of Oil-Bearing Geological Structures, George Welch, W. W. Wetzel
Journal of the Minnesota Academy of Science
No abstract provided.
Geological Conditions Responsible For The Deficiency Of Underground Water In Certain Areas In Minnesota, Geo. A. Thiel
Geological Conditions Responsible For The Deficiency Of Underground Water In Certain Areas In Minnesota, Geo. A. Thiel
Journal of the Minnesota Academy of Science
No abstract provided.