Arctic rocks may contain oldest remnants of Earth (http://www.bbc.co.uk/news/science-environment-10941026)
QuoteScientists have found Arctic rocks that may preserve the earliest remnants of Earth.
Over billions of years, much of the material that made up the early Earth was modified by processes such as melting and mixing.
But the Arctic rocks seem to contain chemical signatures that date from just after the Earth's violent origin.
If confirmed, the discovery challenges established theories about the formation of our planet.
The results of the study are published today in the leading journal, Nature...
Quite the discovery! This sets the chemical clock running in terms of dating and fills in a 700 million year gap.