IMPRINT OF CONTINENTAL-GLACIER EROSION OVER SPACE AND TIME: THREE EXAMPLES FROM OHIO, USA

IMPRINT OF CONTINENTAL-GLACIER EROSION OVER SPACE AND TIME: THREE EXAMPLES FROM OHIO, USA

Bibliographic Details
Main Author: STEWART, ALEXANDER KNOX
Language:English
Published: University of Cincinnati / OhioLINK 2007
Subjects:
Geology
glacier erosion
Laurentide Ice Sheet
bedrock topography
Optically Stimulated Luminescence (OSL)
interlobate area
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=ucin1194891759
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-ucin11948917592021-08-03T06:12:09Z IMPRINT OF CONTINENTAL-GLACIER EROSION OVER SPACE AND TIME: THREE EXAMPLES FROM OHIO, USA STEWART, ALEXANDER KNOX Geology glacier erosion Laurentide Ice Sheet bedrock topography Optically Stimulated Luminescence (OSL) interlobate area Glacial erosion, a first order process in glaciated areas varies over time and space. To determine the spatial and temporal variabilities of glacial erosion requires an understanding of the topography prior to and between glacial erosion events. The terminal area of Pleistocene ice sheets provides one such area for examination because glacial erosion disappears at the ice sheet edge. Two interlobate areas near the ice sheet margin in northeastern (NE) and southwestern (SW) Ohio were analyzed using three approaches: 1) bedrock-topography patterns in both the SW and NE study areas; 2) optically stimulated luminescence (OSL) and till stratigraphy data from the NE study area; and 3) glacial geomorphology and stratigraphy of the SW study area. The bedrock-topography studies reveal spatial variations in glacial erosion at the mesoscale (1,000’s km2) resulting from ~2.0 million years of glacial erosion. In both study areas, patterns of preserved bedrock channels parallel and perpendicular to flow reveal adjacent “deep” and “shallow” erosion zones associated with the palaeotopography. The OSL dating and till stratigraphy data of NE Ohio reveal a Late Illinoian kame terrain that survived a later glacial advance, either below cold-based ice or standing as a nunatak during the Last Glacial Maximum. The glacial geomorphic study in SW Ohio shows that a topographic upland was an impediment to glacial advance and was covered by thin, weak/stagnant, possibly cold-based ice. Focused around this upland was thicker, warm-based, ice that was an effective erosive agent. The erosion patterns reported here are the first to demonstrate the long-term, relatively minor, erosive effects of the Laurentide ice sheet margin. 2007 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1194891759 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1194891759 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Geology
glacier erosion
Laurentide Ice Sheet
bedrock topography
Optically Stimulated Luminescence (OSL)
interlobate area
spellingShingle Geology
glacier erosion
Laurentide Ice Sheet
bedrock topography
Optically Stimulated Luminescence (OSL)
interlobate area
STEWART, ALEXANDER KNOX
IMPRINT OF CONTINENTAL-GLACIER EROSION OVER SPACE AND TIME: THREE EXAMPLES FROM OHIO, USA
author STEWART, ALEXANDER KNOX
author_facet STEWART, ALEXANDER KNOX
author_sort STEWART, ALEXANDER KNOX
title IMPRINT OF CONTINENTAL-GLACIER EROSION OVER SPACE AND TIME: THREE EXAMPLES FROM OHIO, USA
title_short IMPRINT OF CONTINENTAL-GLACIER EROSION OVER SPACE AND TIME: THREE EXAMPLES FROM OHIO, USA
title_full IMPRINT OF CONTINENTAL-GLACIER EROSION OVER SPACE AND TIME: THREE EXAMPLES FROM OHIO, USA
title_fullStr IMPRINT OF CONTINENTAL-GLACIER EROSION OVER SPACE AND TIME: THREE EXAMPLES FROM OHIO, USA
title_full_unstemmed IMPRINT OF CONTINENTAL-GLACIER EROSION OVER SPACE AND TIME: THREE EXAMPLES FROM OHIO, USA
title_sort imprint of continental-glacier erosion over space and time: three examples from ohio, usa
publisher University of Cincinnati / OhioLINK
publishDate 2007
url http://rave.ohiolink.edu/etdc/view?acc_num=ucin1194891759
work_keys_str_mv AT stewartalexanderknox imprintofcontinentalglaciererosionoverspaceandtimethreeexamplesfromohiousa
_version_ 1719432672790446080

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