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The Illinoian Stage is the name used by Quaternary geologists in North America to designate the Penultimate Glacial Period c.191,000 to c.130,000 years ago, during the late Middle Pleistocene (Chibanian), when sediments comprising the Illinoian Glacial Lobe were deposited.
The most obvious glacial feature in Illinois is Lake Michigan, the basin of which was carved out by glaciers. [6] As the glaciers receded they left a large number of recessional moraines; among the more visible moraines in the state is the Bloomington Moraine, a Wisconsinan terminal moraine that can be seen in Bureau County.
The Farm Creek Section, also known as the Farmdale Geologic Exposure, is a hillside near East Peoria, Illinois that clearly showed geological strata. It is nationally significant as one of the first exposed glacial stratifications in the United States to be scientifically documented.
[2] [3] [10] [11] More recent geologic mapping, coring, and optically stimulated luminescence (OSL) dating of Illinoian glacial tills (Glasford Formation) and outwash (Pearl Formation) of the Illinoian Glacial Lobe in North-central Illinois demonstrates that the start of the Illinoian stage and end of the Pre-Illinoian stage correlates with the ...
Glacial drift includes unsorted material called till and layers deposited by meltwater streams called outwash. [6] While drift from early (pre-Illinoian) glaciations has been found in some parts of the region, [7] [8] [9] much of the incised Paleozoic Plateau of Wisconsin and northwestern Illinois has no evidence of glaciation.
South of the glacial front, water accumulated faster than it could drain, forming a glacial lake Kankakee. Today, the bedrock is hidden deep beneath the sediments left by the glaciers, but it still played a role in developing the lay of the land. At Momence, Illinois, a ridge of limestone was exposed at the surface.
Gateway Arch National Park in Missouri and Illinois. Glacier National Park in Montana. Glacier Bay National Park in Alaska. Grand Canyon National Park in Arizona. Grand Teton National Park in Wyoming.
Kansan glaciation was used by early geomorphologists and Quaternary geologists to subdivide glacial and nonglacial deposits within north-central United States from youngest to oldest and are as follows: Wisconsin (glacial) Sangamonian (interglacial) Illinoian (glacial) Yarmouthian (interglacial) Kansan (glacial) Aftonian (interglacial ...