Late Wisconsinan Glacial Geomorphology of the Kent Interlobate Complex, Ohio, USA
The northern sector of the Kent Interlobate Complex, created by two major ice lobes of the Laurentide Ice Sheet during late Wisconsinan times, dominates the glacial landscape of northeast Ohio. The geomorphology of this impressive complex reveals the presence of large hummocks, kettle lakes and subs...
| Published in: | Finisterra |
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| Main Author: | |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Universidade de Lisboa
2012
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10316/109867 https://doi.org/10.18055/Finis1258 |
| Summary: | The northern sector of the Kent Interlobate Complex, created by two major ice lobes of the Laurentide Ice Sheet during late Wisconsinan times, dominates the glacial landscape of northeast Ohio. The geomorphology of this impressive complex reveals the presence of large hummocks, kettle lakes and substantial esker chains. The esker chains, usually smaller than 1.3 km long, run parallel to the interlobate complex geographic orientation of northeast-southwest. Gravel pits present on large hummocks display bedded and sorted sedimentary units of gravel, sand and gravel and climbing ripple laminated sand with folds, which demonstrate that the northern sector of the interlobate complex is primarily a glaciofluvial feature. Topping these hummocks is a massive clast-supported diamicton interpreted to be a debris flow. These geomorphic and sedimentary characteristics seem to indicate that hummocks present in the interlobate area are in fact kames and that the entire northern sector of the interlobate complex is a product of late Wisconsinan time transgressive ice stagnation that occurred between two major ice lobes. O sector norte do Complexo Interlobular de Kent, criado por dois dos principais lóbulos de gelo do Inlandis de Laurentide durante o Tardi- Wisconsinan, domina a paisagem glaciária do nordeste do Ohio. A geomorfologia deste complexo apresenta hummocks, kettle lakes e diversas cadeias de eskers. As cadeias de eskers, geralmente de comprimento inferior a 1.3 km, possuem uma orientação nordeste- -sudoeste, paralela à do complexo interlobular. Areeiros presentes nos hummocks apresentam unidades sedimentares calibradas de calhaus, de calhaus e areias intercaladas e de areias laminadas com climbing ripples e folds, que demonstram que o complexo interlobular é essencialmente uma forma fluvioglaciária. No topo dos hummocks verifica-se ainda a existência de um diamicton clasto-suportado interpretado como sendo um depósito de vertente. As características geomorfológicas e sedimentológicas dos hummocks presentes no ... |
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