The Atlantic Ocean formed when the supercontinent Pangaea began to split apart about million years ago. The radiation damage means the zircons could have been contaminated during their long lifetime. Close What are you looking for? When solving a big problem seems impossible, break it into smaller steps. They recount days of national loss and tragedy like December 7, and September 11, The oldest known moon rocks, at about 4.
It may be that the oxygen isotopes and other compositional features the rare-earth elements record more recent hydrothermal alteration of the zircons rather than the composition of the magma at the time of their original crystallization.
4.55 ± 0.05 Gyr
Retrieved 25 January Human timelineand Nature timeline. Washington, DC:
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