The Canadian Shield constitutes the continental interior (or craton) of North America. It is composed of ancient crystalline rocks with a complex structure because of a long history of uplift, depression, mountain building (orogeny), and erosion from the movement of ice back and forth across the surface. It is the largest mass of exposed Precambrian rock on Earth.
verifiedCite
While every effort has been made to follow citation style rules, there may be some discrepancies.
Please refer to the appropriate style manual or other sources if you have any questions.
Select Citation Style