How old are Earth’s oldest rocks?

The Allende Meteorite tells us that the Earth is about 4.567 billion years old, but the oldest rocks at the surface of the Earth are a bit younger than that. Now a team has found rocks at the surface which as 4.28 billion years old:

http://news.bbc.co.uk/1/hi/sci/tech/7639024.stm

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Is life even older than we thought?

The palaeontology of the earliest signs of life is a blend of chemistry and mineralogy. Uncertainty is part of life for people dealing with the most ancient evidence. Geologists are communally convinced that they have solid signs of life which are ~4.2 billion years old, but some samples seem to suggest an even earlier date.

http://news.bbc.co.uk/1/hi/sci/tech/7483451.stm