Canadian Shield
From Ohio History Central
Revision as of 15:18, 24 April 2013 by Unknown user (talk)
 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. |
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. [[Category:{$topic}]]