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Showing 1 to 20 of 25 for “"Lake Agassiz"”.
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Preliminary Study of Lake Agassiz Sediments
<p>The Agassiz sediments have been difficult to study because of their complex stratigraphy and homogeneous lithology. The mineral particle size distribution and the petrography of these sediments were the basis of a preliminary study which allowed a columnar section at Grand Forks to be divided …
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Geologic and Economic Aspects of Lake Agassiz Clays
… properties and economic aspects of the clays of Lake Agassiz. The lake was located in the present Red River Valley, a leading farming area. The first complete study of the area was made by Warren Upham in the 1890’s. </p><p>Lake Agassiz covered an area of 110,000 square miles. It had the deltas, …
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Stratigraphy of offshore sediment of Lake Agassiz, North Dakota
<p>Lake Agassiz occupied the Red River Valley between about 13,800 and 9,000 years ago. The Late Wisconsinan ice sheet that covered the Red River Valley retreated far enough to expose the drainage divide in northern South Dakota and south-central Minnesota sometime after 14,000 B.P. and meltwater …
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Long-Term Hydrologic Sustainability of Calcareous Fens Along Glacial Lake Agassiz Beach Ridges, Northwestern Mn
… calcareous fens are located in the Glacial Lake Agassiz beach ridge complex in northwestern Minnesota. Each of these fens is located immediately downslope of large sand/gravel beach ridges, where peat aprons have accumulated on the seepage face. This investigation characterizes the hydrology …
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Sediments and Structures of Part of Glacial Lake Agassiz in Grand Forks County, North Dakota
… Grand Forks County lies within the glacial Lake Agassiz plain (Fig.2). The lacustrine sediments, as exposed in a drainage ditch along the east edge of sections 16, 21, and 28, T. 154 N., R. 52 W., northwest of Manvel, North Dakota, have been divided into two main groups: the lower bedded …
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Relationship of the Turtle, Forest, and Park rivers to the history of glacial Lake Agassiz
… The regimen of rivers once draining into glacial Lake Agassiz was probably affected by changes in base level associated with fluctuations of that lake. The Turtle, Forest, and Park rivers, which presently flow eastward across the bed of Lake Agassiz, show little irrefutable evidence of base level …
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The Lithology of Herman and Campbell Beach of Glacial Lake Agassiz in the Area of Larimore and Arvilla, North Dakota
… of Herman and Campbell beaches of Glacial Lake Agassiz was studied in this report. It was found that the beaches are similar in that the material is 30 to 50 percent by weight over 4 mm. in diameter in both beaches. No shale is present in the sand of Campbell, although there is some in the …
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The geologic history of Lake of the Woods, Minnesota, reconstructed using seismic-reflection imaging and sediment core analysis
The history of glacial Lake Agassiz is complex and has intrigued researchers for over a century. Over the course of its ~5,000 year existence, the size, shape, and location of Lake Agassiz changed dramatically depending on the location of the southern margin of the Laurentide Ice Sheet (LIS), the …
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Pleistocene stratigraphy of the Red Lake Falls area, Minnesota
… are present along a 50-mile stretch of the Red Lake River in Pennington, Red Lake, and Polk Counties, Minnesota. Five formations are largely glacial, sediment, and two are largely lacustr1ne sediment deposited during phases of Lake Agassiz. </p><p> The Gervais Formation (pre-Wisconsinan or early …
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Ground-Water conditions in the Southern Red River Valley, North Dakota
… north-sloping basin formerly occupied by glacial Lake Agassiz.</p> <p>Geologic units in the area are as follows, from the oldest to most recent: Precambrian rocks; the Dakota Standstone; Cretaceous shales; older drift subdivided into lake deposits, buried outwash deposits and till and associated …
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Quaternary geology of the southern part of the Grand Forks and Bemidji quadrangles
… (scale 1:250,000) can be divided into the Lake-Plain Province, the Shoreline-Complex Province, the Glacial-Upland Province, and the Outwash Province. The Lake-Plain Province in the western part of the study area is a rather flat, featureless plain that is largely underlain by laminated silt …
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Developing a rapid method for assessing the physical stability of streams in Minnesota's Agassiz beach ridges
… that cross the eastern beach ridges of glacial Lake Agassiz. Stream and river channels in this area host unusually diverse aquatic habitat and biodiversity, but incompatible land use along channels and in watersheds impair their quality and function. Previous rapid assessment protocols have been …
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Pleistocene geology of the Grand Forks-Bemidji area, northwestern Minnesota
… test holes, two measured sections along the Red Lake River, two composite sections from earlier drilling pro grams and surface exposures were used to characterize seven near surface lithostratigraphic units in the area. From oldest to youngest they are unnamed unit 1, unnamed unit 2, the Marcoux …
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Pleistocene geology of the Comstock-Sebeka area, west-central Minnesota
… geomorphic districts are recognized. The flat Lake-Plain District is underlain by sand, silt, and clay that was deposited as offshore sediment in the Lake Agassiz basin in Early Holocene time. The flat to rolling Shoreline-Complex District is underlain largely by lacustrine shoreline sand and …
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The late Cenozoic geology of west-central Minnesota from Moorhead to Park Rapids
… study area.</p> <p>The creation and drainage of Lake Agassiz occurred during the seventh episode, between 13 000 years B. P. to 9 500 years B. P. The sediment deposited as a result of this event is contained in the Sherack Formation, Downer Formation, Argusville Formation, and Poplar River …
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Holocene sea-level changes in the Falkland Islands: new insights into accelerated sea-level rise in the 20th Century
… to the sudden drainage of Laurentide proglacial lake Agassiz-Ojibway associated with the 8.2 ka BP climatic downturn. A maximum estimate of 0.89 ± 0.22 m for this jump in the Falklands is considerably less than estimates from Northern Hemisphere records. This difference could indicate additional …
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Hydrologic factors affecting the discharge of ground water in the Red River of the North Basin, northeastern North Dakota
… advances and lacustrine sediments from glacial Lake Agassiz. These units form confining layers over the bedrock aquifers and limit the rate of ground-water discharge from bedrock sources.</p> <p>The three mechanisms responsible for salinity reaching the land surface are advection, diffusion, and …
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Hydrogeologic Characterization of a discharge wetland in northeastern Grand Forks County, North Dakota
… agricultural production in the central glacial Lake Agassiz plain of North Dakota. Saline discharge occurs in a belt of ephemeral wetlands in the lake plain. The physical and chemical hydrology of .the Lunby-stewart saline discharge wetland were investigated in order to provide information which …
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Glacial stratigraphy of northwestern Cass County, North Dakota
… glaciolacustrine topography, 3) proglacia1 lake sediment, 4) wave-eroded glacial and lake sediments and 5) recent river sediment. Landforms within each of these areas include eskers, abandoned or overfit river channels, transverse ridges, ice thrust masses, kettles and beach deposits.</p> …
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