Ages of Construction of North America

Figure 7 depicts the three phases of construction for North America and its plate boundaries. The purple colored area is oldest North America, now in low relief, called the Canadian shield. Note how North America's west edge stops at the San Andreas fault, while the lands west of there now belong to the Pacific plate. But our continent is firmly attached to the western half of the Atlantic Ocean and so our eastern boundary is the mid-Atlantic ridge.

Sections 8 & 9. Maps of Rodinia supercontinent

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