Oldest rocks ever!

Baffin Island's "old" rocks

Some rocks were found on Baffin Island in the Canadian Arctic that give clues to the composition of the Earth shortly after it was formed. The rocks  are only 69 million years old. However, their isotopic composition suggests that they were formed from the material of the Earth’s primitive mantle. As such, they provide extra evidence for the composition of that mantle and refute some hypotheses about it.


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