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Contents of Age of Earth

Age of Earth

• The oldest rock found so far is gneiss resulting from metamorphism of a tonalite intrusion in northwestern Canada is 4.030 billion years old
• Sandstone in Australia contains zircon sand grains as old as 4.4 billion years - oldest mineral
• Various estimates of Earth's age range from 4.4 to 4.56 billion years, so 4.50 +0.06 billion years old