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Figure 3. Cambrian Laurentia

Cambrian Laurentia approximately 500 million years ago. The grid overlaying the continent identifies the location of the current U.S. states and Canadian provinces. The continent is reconstructed with modern orientation, but note its position with respect to the equator located at the far left of the grid.
Reproduced with permission from Key Time Slices of North America Ⓒ 2013 Colorado Plateau Geosystems Inc.