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Quarternary Glaciations in Illinois (GeoNote 3)

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Geoscience
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NSDL Staff
Provider Set:
Geosciences Gateways and Resources
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Middle School, High School, Community College / Lower Division, Career / Technical, Adult Education
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Video
NSDL Staff Abstract:

This brief publication from the Illinois State Geological Survey describes how over the past 1.6 million years, known as the Quaternary (kwa-TURN-ah-ree) Period of geologic time, most of the northern hemisphere above the 50th parallel was repeatedly covered by glacial ice. The cooling of the earth‰ŰŞs surface began at least 2 million years ago, and with that cooling, ice sheets eventually formed in subarctic regions and spread outward until they covered the northern parts of North America. With ongoing climatic change during this period, these ice sheets would form and reform many times.

NSDL Staff Abstract:

This brief publication from the Illinois State Geological Survey describes how over the past 1.6 million years, known as the Quaternary (kwa-TURN-ah-ree) Period of geologic time, most of the northern hemisphere above the 50th parallel was repeatedly covered by glacial ice. The cooling of the earth’s surface began at least 2 million years ago, and with that cooling, ice sheets eventually formed in subarctic regions and spread outward until they covered the northern parts of North America. With ongoing climatic change during this period, these ice sheets would form and reform many times.

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