Geologic map of North America. Ages of the bedrock - red (oldest) to blue, green, yellow (newest)
Geologic map of North America. Ages of the bedrock - red (oldest) to blue, green, yellow (newest)
“The oldest rock there is some of the oldest on the entire planet, going back billions of years. Billions. You can go there and look at something that was fully-formed when life on Earth consisted of ocean microbes”–KubrickIsMyCopilot