The Canadian Shield, also called the Laurentian Plateau, or Bouclier canadien (French), is a large area of exposed Precambrian igneous and high-grade metamorphic rocks (geological shield) that forms the ancient geological core of the North American continent (the North American Craton or Laurentia).
As a rule the Mother Lode deposits are large but of comparatively low grade, the average tenor being about $4 a ton. Some mines exploit large bodies of ore that carry, less than $3 a ton, but pockets of very rich ore concentrations have also been found.
National Parks. For detailed information about any national park, click the park name below. For a list of discounted cruises and cruise tours that visit one of these national parks (or an adjacent town or lodge with access to the park), make your selection and click "Show Me the Deals!"
This index lists all articles published in Dragon and Strategic Review, alphabetically by subject.The author, issue/page number and game system is listed for each entry. Where a "--" is noted under "System", it means that article does not pertain to any specific game system, or to several different syste
Mysterious and often inexplicable remnants of civilization's history fascinate scientists and archaeologists. People travel worldwide to visit such sites, yet some of the most enigmatic artifacts and structures have been found right here in North America.