| the extensive region making up much of northern and central Canada underlain by Precambrian rocks that have been eroded to produce a low shieldlike profile. |
| Canadian Shield See Laurentian Plateau. |
| Laurentian Plateau or Laurentian Highlands also Canadian Shield 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. |