Canadian Shield
Precambrian igneous and metamorphic rocks are exposed in eastern and central Canada and form the core of the North American continent. Continental collisions and mountain-building events added crust to the shield during Precambrian time. Some of these rocks underlie Paleozoic sedimentary rocks in Ohio.
The Canadian Shield — also called the Laurentian Plateau is a large geological shield covered by a thin layer of soil that forms the nucleus of the North American or Laurentia craton.
Citation
"Canadian Shield", Ohio History Central, July 13, 2007, http://www.ohiohistorycentral.org/entry.php?rec=2862
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