ILLINOIS STATE GEOLOGICAL SURVEY
The surficial geology of the Antioch Quadrangle is primarily the result of glacial activity of the last (Wisconsin Episode) glaciation occurring between about 25,000 and 14,000 radiocarbon years ago. During this period, diamicton (a mixture of clay, silt, sand, and rocks) was deposited under, on top...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.595.6392 2023-05-15T16:40:36+02:00 ILLINOIS STATE GEOLOGICAL SURVEY Andrew J. Stumpf Michael L. Barnhardt William W. Shilts The Pennsylvania State University CiteSeerX Archives 2005 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.6392 http://www.isgs.illinois.edu/maps-data-pub/isgs-quads/a/pdf-files/antioch-sg-rept.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.6392 http://www.isgs.illinois.edu/maps-data-pub/isgs-quads/a/pdf-files/antioch-sg-rept.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.isgs.illinois.edu/maps-data-pub/isgs-quads/a/pdf-files/antioch-sg-rept.pdf text 2005 ftciteseerx 2016-01-08T13:43:18Z The surficial geology of the Antioch Quadrangle is primarily the result of glacial activity of the last (Wisconsin Episode) glaciation occurring between about 25,000 and 14,000 radiocarbon years ago. During this period, diamicton (a mixture of clay, silt, sand, and rocks) was deposited under, on top of, and adjacent to the ice sheet. Meltwater generated from the glaciers was drained through subglacial channels or in rivers flowing away from the ice. Where glaciers or sediment blocked drainage (marginal to and on top of the ice), lakes were formed. Since about 14,000 years ago (Hudson Episode), the ice melted and the materials have been reworked by modern water and slope processes. The surface diamicton unit in the map area, the Wadsworth Formation, forms a hummocky morainal upland comprising segments of the Valparaiso Morainic System and Tinley Moraine west of Lake Michigan (fig. 1). The Wadsworth diamicton is a till that was deposited beneath the glacier. The diamicton is fairly uniform, however, it can also be comprised of interbeds of sorted material (glacial, river, and lake sediments), suggesting that materials deposited by debris-rich ice were significantly reworked at the margin and under the ice sheet. Although predominantly fine-grained, the upper part of the diamicton may have a sandier texture, especially at the base of slopes or in depressions on the 2uplands, where it has been modified by slope processes or water. Text Ice Sheet Unknown Hudson Ice Lakes ENVELOPE(-131.345,-131.345,60.413,60.413) Quadrangle ENVELOPE(-68.578,-68.578,-71.577,-71.577) |
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Open Polar |
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ftciteseerx |
language |
English |
description |
The surficial geology of the Antioch Quadrangle is primarily the result of glacial activity of the last (Wisconsin Episode) glaciation occurring between about 25,000 and 14,000 radiocarbon years ago. During this period, diamicton (a mixture of clay, silt, sand, and rocks) was deposited under, on top of, and adjacent to the ice sheet. Meltwater generated from the glaciers was drained through subglacial channels or in rivers flowing away from the ice. Where glaciers or sediment blocked drainage (marginal to and on top of the ice), lakes were formed. Since about 14,000 years ago (Hudson Episode), the ice melted and the materials have been reworked by modern water and slope processes. The surface diamicton unit in the map area, the Wadsworth Formation, forms a hummocky morainal upland comprising segments of the Valparaiso Morainic System and Tinley Moraine west of Lake Michigan (fig. 1). The Wadsworth diamicton is a till that was deposited beneath the glacier. The diamicton is fairly uniform, however, it can also be comprised of interbeds of sorted material (glacial, river, and lake sediments), suggesting that materials deposited by debris-rich ice were significantly reworked at the margin and under the ice sheet. Although predominantly fine-grained, the upper part of the diamicton may have a sandier texture, especially at the base of slopes or in depressions on the 2uplands, where it has been modified by slope processes or water. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Andrew J. Stumpf Michael L. Barnhardt William W. Shilts |
spellingShingle |
Andrew J. Stumpf Michael L. Barnhardt William W. Shilts ILLINOIS STATE GEOLOGICAL SURVEY |
author_facet |
Andrew J. Stumpf Michael L. Barnhardt William W. Shilts |
author_sort |
Andrew J. Stumpf |
title |
ILLINOIS STATE GEOLOGICAL SURVEY |
title_short |
ILLINOIS STATE GEOLOGICAL SURVEY |
title_full |
ILLINOIS STATE GEOLOGICAL SURVEY |
title_fullStr |
ILLINOIS STATE GEOLOGICAL SURVEY |
title_full_unstemmed |
ILLINOIS STATE GEOLOGICAL SURVEY |
title_sort |
illinois state geological survey |
publishDate |
2005 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.6392 http://www.isgs.illinois.edu/maps-data-pub/isgs-quads/a/pdf-files/antioch-sg-rept.pdf |
long_lat |
ENVELOPE(-131.345,-131.345,60.413,60.413) ENVELOPE(-68.578,-68.578,-71.577,-71.577) |
geographic |
Hudson Ice Lakes Quadrangle |
geographic_facet |
Hudson Ice Lakes Quadrangle |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
http://www.isgs.illinois.edu/maps-data-pub/isgs-quads/a/pdf-files/antioch-sg-rept.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.6392 http://www.isgs.illinois.edu/maps-data-pub/isgs-quads/a/pdf-files/antioch-sg-rept.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766031001736183808 |