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Resource Title:Quarternary Glaciations in Illinois (GeoNote 3)
Description: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.

Additional Resource Information

Author Contributed By Dwain J. Berggren
Contributor(s) Revised January 2000 By Myrna M. Killey
Grade Level General Public
High School
Higher Education
Informal Education
Middle School
Technical Education (Lower Division)
Undergraduate (Lower Division)
Intended Audience Educator
General Public
Learner
Publisher / Resource Provider Illinois State Geological Survey
Resource Type Article
Audio/Visual
Illustration
Image
Nonfiction Reference
Reference Material
StillImage
Text
Subject Keyword(s) Geoscience
Glaciers