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TREC: Glaciation Glaciation is responsible for much of the landscape in the northern mid-latitudes and is the result of periodic worldwide climate changes. The types of glacial landforms permit reconstruction of ice margins and glacier dynamics. Stratigraphy, texture, and composition of glacial deposits can be used to define individual glacial advances and changes in source area of the ice. The distribution of landforms affects the ecology, distribution of natural resources, and human settlement patterns in glaciated terrain.
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Block diagram constructed from the analysis of sediment cores from beneath Tower City in Cleveland, Ohio. The lower diamict, consisting of possibly three different Illinoian tills, overlies Devonian Ohio Shale. The lower lacustrine deposits between the upper and lower diamicts may range from Illinoian to Late Wisconsinan in age. The upper diamict may have been deposited by Late Wisconsinan Hiram ice advancing into a proglacial lake. The upper lacustrine sediments were deposited in ancestors of Lake Erie including Lakes Maumee, Arkona, and Whittlesey. A radiocarbon date on twigs in lacustrine clays implies that north-central Ohio was ice free by 14,500 yr BP. The beach sands and gravels may be partially deltaic in origin and were reworked by Lake Warren. The post-glacial valley of the Cuyahoga River was formed when the creation of Niagara Falls caused the water levels to drop 40 m to the level of Early Lake Erie. As the Niagara Falls area raised isostatically, the valley was filled with Holocene alluvium. |
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A Giddings soil probe is being used to take cores of late glacial lacustrine deposits near White Pine Bog in Geauga County, Ohio.
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Field Equipment - Two 15-passenger vans
- One four wheel drive vehicle
- Giddings soil probe - core samples of glacial deposits to a depth of 40 feet
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Students from the glacial geology class are describing and sampling core for a class project.
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| Dr. Szabo excavates a trench into stoney Illinoian till at Grand River lobe in northeastern Ohio. |
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