Canadian ShieldCanadian Shield
an area of about 2,000,000 sq mi (5,179,980 sq km) of Precambrian strata, consisting largely of granite, gneiss, marble, and other igneous and metamorphic rocks that occupy most of eastern and central Canada & part of NE U.S.
or Laurentian Plateau
A plateau region of eastern Canada extending from the Great Lakes and the St. Lawrence River northward to the Arctic Ocean. The highland formation also covers much of Greenland and forms the Adirondack Mountains in the United States.