Washboard moraines in northeastern North Dakota
The descriptive term 11washboard moraine" has been applied to small transverse till ridges occurring in glaciated regions of North America. Washboard moraines have, in the past, been confused with similar transverse features such as ribbed moraines and De Geer moraines. No previous work had bee...
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ftunivndakota:oai:commons.und.edu:theses-1209 2023-06-11T04:12:21+02:00 Washboard moraines in northeastern North Dakota Nielsen, Dennis N. 1969-01-01T08:00:00Z application/pdf https://commons.und.edu/theses/210 https://commons.und.edu/context/theses/article/1209/viewcontent/Nielsen__Dennis__N.__MS_Thesis_1969.pdf https://commons.und.edu/context/theses/article/1209/filename/0/type/additional/viewcontent/Nielsen_Plate.zip unknown UND Scholarly Commons https://commons.und.edu/theses/210 https://commons.und.edu/context/theses/article/1209/viewcontent/Nielsen__Dennis__N.__MS_Thesis_1969.pdf https://commons.und.edu/context/theses/article/1209/filename/0/type/additional/viewcontent/Nielsen_Plate.zip Theses and Dissertations Geology--North Dakota Glaciers--North Dakota Moraines--North Dakota Geology text 1969 ftunivndakota 2023-05-07T17:30:06Z The descriptive term 11washboard moraine" has been applied to small transverse till ridges occurring in glaciated regions of North America. Washboard moraines have, in the past, been confused with similar transverse features such as ribbed moraines and De Geer moraines. No previous work had been done on washboard moraines in North Dakota prior to this study. Objectives of this study were to (1) map the distribution of washboard moraines in a selected study area,(2) describe the morphology and composition of washboard moraines, (3) determine the origin !or washboard moraines, and (4) compare data obtained in North Dakota with previously published information. Northern Nelson County, North Dakota, was chosen as the study area. Washboard moraines were mapped, sampled, measured and compared in the field. The structure of selected washboard moraines was determined by using pebble fabric analysis. Washboard moraines in northern Nelson County are generally 4 to 15 feet high and are spaced 250 to 550 feet apart. The moraines are subdued, discontinuous, irregular ridges paralleling each other. The moraines are composed of slightly gravelly loam. The till bas unimodal, bimodal and polymodal grain-fabric distribution; preferred orientations were generally unrelated to regional ice flow direction. Some washboard moraines cross askers and drumlinoid features. Slopes ranged from 2° to 6° and showed no proximal or distal slope variation. Based on Nelson County field observation and on studies in Greenland and Alberta, washboard moraines appear to be remnant shear moraines that were deposited from a superglacial position. Evidence of this includes (1) the crossing of some eskers and drumlinoid features by washboard moraines, (2) the discontinuous and irregular shape of washboard moraines, (3) the absence of consistent proximal and distal slope variation, and (4) the preferentially oriented till fabrics unrelated to regional ice flow. The shear moraines were formed by shearing of active ice over stagnant ice in marginal ... Text Greenland UND Scholarly Commons (University of North Dakota) Greenland |
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Open Polar |
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UND Scholarly Commons (University of North Dakota) |
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ftunivndakota |
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unknown |
topic |
Geology--North Dakota Glaciers--North Dakota Moraines--North Dakota Geology |
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Geology--North Dakota Glaciers--North Dakota Moraines--North Dakota Geology Nielsen, Dennis N. Washboard moraines in northeastern North Dakota |
topic_facet |
Geology--North Dakota Glaciers--North Dakota Moraines--North Dakota Geology |
description |
The descriptive term 11washboard moraine" has been applied to small transverse till ridges occurring in glaciated regions of North America. Washboard moraines have, in the past, been confused with similar transverse features such as ribbed moraines and De Geer moraines. No previous work had been done on washboard moraines in North Dakota prior to this study. Objectives of this study were to (1) map the distribution of washboard moraines in a selected study area,(2) describe the morphology and composition of washboard moraines, (3) determine the origin !or washboard moraines, and (4) compare data obtained in North Dakota with previously published information. Northern Nelson County, North Dakota, was chosen as the study area. Washboard moraines were mapped, sampled, measured and compared in the field. The structure of selected washboard moraines was determined by using pebble fabric analysis. Washboard moraines in northern Nelson County are generally 4 to 15 feet high and are spaced 250 to 550 feet apart. The moraines are subdued, discontinuous, irregular ridges paralleling each other. The moraines are composed of slightly gravelly loam. The till bas unimodal, bimodal and polymodal grain-fabric distribution; preferred orientations were generally unrelated to regional ice flow direction. Some washboard moraines cross askers and drumlinoid features. Slopes ranged from 2° to 6° and showed no proximal or distal slope variation. Based on Nelson County field observation and on studies in Greenland and Alberta, washboard moraines appear to be remnant shear moraines that were deposited from a superglacial position. Evidence of this includes (1) the crossing of some eskers and drumlinoid features by washboard moraines, (2) the discontinuous and irregular shape of washboard moraines, (3) the absence of consistent proximal and distal slope variation, and (4) the preferentially oriented till fabrics unrelated to regional ice flow. The shear moraines were formed by shearing of active ice over stagnant ice in marginal ... |
format |
Text |
author |
Nielsen, Dennis N. |
author_facet |
Nielsen, Dennis N. |
author_sort |
Nielsen, Dennis N. |
title |
Washboard moraines in northeastern North Dakota |
title_short |
Washboard moraines in northeastern North Dakota |
title_full |
Washboard moraines in northeastern North Dakota |
title_fullStr |
Washboard moraines in northeastern North Dakota |
title_full_unstemmed |
Washboard moraines in northeastern North Dakota |
title_sort |
washboard moraines in northeastern north dakota |
publisher |
UND Scholarly Commons |
publishDate |
1969 |
url |
https://commons.und.edu/theses/210 https://commons.und.edu/context/theses/article/1209/viewcontent/Nielsen__Dennis__N.__MS_Thesis_1969.pdf https://commons.und.edu/context/theses/article/1209/filename/0/type/additional/viewcontent/Nielsen_Plate.zip |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Theses and Dissertations |
op_relation |
https://commons.und.edu/theses/210 https://commons.und.edu/context/theses/article/1209/viewcontent/Nielsen__Dennis__N.__MS_Thesis_1969.pdf https://commons.und.edu/context/theses/article/1209/filename/0/type/additional/viewcontent/Nielsen_Plate.zip |
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1768388135427768320 |