The map above shows the ages of bedrock in North America from yellow (youngest) to green to blue to red (oldest). The maps official name is the The North America Tapestry of Time and Terrain.
Making Sense Of The World, One Map At A Time
The map above shows the ages of bedrock in North America from yellow (youngest) to green to blue to red (oldest). The maps official name is the The North America Tapestry of Time and Terrain.