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Four billion years ago, but not so different: Plate tectonics likely looked closer to what we experience today
More specifically, they studied zircons in the 3.9–2.7-billion-year-old Saglek-Hebron Complex and 4.0–3.4-billion-year-old Acasta Gneiss Complex and found that instead of a linear progression ...
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Where Are The Oldest Rocks In The World, And What's Inside Them?
The Guinness World Record for the oldest Earth rock is currently held by the Nuvvuagittuq greenstone belt, which is listed as ...