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Limits of ice age glaciers

Limits of ice age glaciers.jpg Woolly mammothThumbnailsExtent of the main glacial advancesWoolly mammothThumbnailsExtent of the main glacial advancesWoolly mammothThumbnailsExtent of the main glacial advances

In Canada vast thicknesses of snow and ice accumulated until the weight of the ice finally caused it to flow slowly outward, mainly to the south. Rocks and surface materials of all types were picked up and carried by the glaciers for great distances before being deposited. Pieces of granite, quartzite, and native copper among the many local rocks and minerals are found in glacial deposits and indicate that at least part of these deposits came from the Great Lakes Region. The materials deposited range from clay-size minerals to large boulders.


Author
Inside Illinois: Mineral Resources
Educational Series 9
Author: Anonymous Available from gutenberg.org
Keywords
Maps, Prehistoric
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