Zircon crystals found in sandstone on an Australian sheep ranch are so tiny that you'd need a magnifying glass to see them. But recent measurements confirm they offer our earliest glimpse of Earth.
Source: http://www.npr.org/2014/02/24/280888059/at-4-4-billion-years-old-oz-crystals-confirmed-as-worlds-oldest?ft=1&f=1007
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